Easy Strawberry Jello Flag Cake

Category: Quick & Simple Sweet Treats

This berry-studded flag cake starts with a tender vanilla cake base, infused throughout with sweet strawberry Jello for added moisture and flavor. Once cooled, it’s topped generously with whipped cream, then decorated with neat rows of blueberries and sliced strawberries to create a bright and festive American flag pattern. Chill thoroughly before serving so the creamy layers set and flavors meld. This easy dessert is a crowd-pleaser for July celebrations, offering both visual impact and light, refreshing taste with minimal effort. Serve cold for a cooling summer treat that everyone will love.

A woman with a chef's hat holding a plant.
Updated on Sat, 19 Jul 2025 00:06:57 GMT
A slice of cake with strawberries and blueberries on top. Pin
A slice of cake with strawberries and blueberries on top. | quickdinnerfix.com

This fruity and festive strawberry Jello flag cake is my secret weapon for Fourth of July parties because it brings together a crowd-pleasing cake, nostalgic strawberry Jello poke layers, and a billowy whipped cream topping all with the easiest shortcut ingredients. It gets oohs and ahhs every time and could not be more fun to decorate.

I first made this cake when my son begged for a special dessert for Independence Day and now my entire family insists it is not the Fourth unless this flag cake is on the table. Once you try it you will see why.

Ingredients

  • Vanilla cake mix: brings a tender sweet base and makes prep simple always check dates and choose a good brand for the freshest flavor
  • Large eggs: give structure and richness make sure your eggs are fresh for best rising
  • Canola oil: locks in moisture and creates a soft crumb use a neutral oil for clean flavor
  • Strawberry Jello mix: creates that bright pink poke layer and sweet flavor choose a brand you love for color
  • Boiling and cold water: are needed to dissolve and bloom the Jello make sure your water is actually boiling hot and very cold for setting properly
  • Whipped cream: creates a creamy cloudlike topping use real whipped cream or a high-quality whipped topping for best results
  • Blueberries: become your blue field for the flag look for firm plump berries with a deep blue hue
  • Fresh strawberries: are sliced to create classic flag stripes aim for ripe berries that are deep red and fragrant for the best look and taste

Step-by-Step Instructions

Gather and Prep:
Wash and dry all your berries carefully so no water waters down your whipped cream later Pick out the brightest strawberries and firmest blueberries for decorating
Mix and Bake Cake:
In a large bowl combine the vanilla cake mix water canola oil and eggs Mix following your box directions until smooth Pour batter into a well-greased nine by thirteen inch pan Bake based on your box’s instructions until golden and a toothpick comes out clean
Cool and Prep Jello:
Let the cake cool for fifteen to twenty minutes while you mix the Jello In a medium bowl combine the strawberry Jello mix with one cup boiling water Stir until fully dissolved Add cold water and stir again so the mixture is smooth and bright pink
Poke and Fill Cake:
Once the cake is just warm use a fork to poke holes all over the top making sure to go about two thirds of the way down Slowly and evenly pour the Jello mixture all over so it soaks in and turns the cake stripes a pretty pink Let cake cool completely
Frost with Whipped Cream:
Once fully cooled use a soft spatula to gently spread whipped cream over the cake surface Be gentle so you do not tear the cake You want an even smooth layer
Decorate the Flag:
In the top left corner arrange about five rows of blueberries to form the stars box Slice strawberries lengthwise and arrange in neat rows across the cake to create bold red stripes Aim for at least four rows and space them evenly for best visual impact
Chill and Serve:
Cover the cake and refrigerate for three to four hours Letting it chill fully makes the flavors meld and makes for easier slicing Serve cold for the most refreshing taste
A slice of strawberry jello flag cake. Pin
A slice of strawberry jello flag cake. | quickdinnerfix.com

I adore how the strawberries shine in this cake and make it taste so fresh You can almost taste the sunshine in every bite When we made this for our family reunion last summer everyone wanted seconds and my young niece loved adding blueberries to the flag corner

Storage Tips

Store your jello cake tightly covered in the fridge as whipped cream and berries are sensitive to air and warmth It will keep for two to three days and stays just as moist on day two For longer storage try slicing and wrapping pieces individually to make it easy to grab for picnics or any leftover snack attack

Ingredient Substitutions

If you need gluten free simply use a gluten free cake mix and check any other packaged ingredients for gluten markings Prefer a different berry You can swap blackberries or raspberries for a pretty twist and different stripe pattern For less sweetness try using a natural fruit based gelatin mix

Serving Suggestions

Bring this cake chilled to any summer barbecue and serve in generous slices with a few extra berries on the side For extra flair add little American flag picks or tiny white chocolate stars If it is a birthday celebration use number candles in the blue corner and sprinkle popping candy over the whipped cream for fun

A slice of cake with strawberries and blueberries on top. Pin
A slice of cake with strawberries and blueberries on top. | quickdinnerfix.com

Cultural Historical Context

The tradition of flag cakes shows up at many American celebrations all summer with the classic red white and blue especially tied to Independence Day The poke cake style came from home cooks in the seventies looking to jazz up easy box cakes Strawberry Jello makes it colorful and nostalgic reminding so many of their childhood or community picnics

Recipe FAQs

→ Can I use a different cake mix flavor?

Yes, you can substitute vanilla cake mix with white or yellow cake mix for similar results and flavor.

→ How do I prevent the cake from crumbling while spreading whipped cream?

Spread the whipped cream gently using a spatula, being careful not to press too hard, as the cake is delicate after poking.

→ Can I make this dessert gluten-free?

Absolutely! Swap in your favorite gluten-free cake mix, just follow that mix’s package directions for accurate results.

→ How long should I chill the cake before serving?

Refrigerate the finished cake for at least 3 to 4 hours so the layers set and the dessert is cool and refreshing.

→ What’s the best way to store leftovers?

Cover the cake and refrigerate. It will stay fresh for 2 to 3 days. Keep chilled when not serving to maintain texture.

→ Can I use different berries for decoration?

Yes, you may substitute raspberries for strawberries or add blackberries for a twist, but it will change the flag look slightly.

Easy Strawberry Jello Flag Cake

Box cake layered with strawberry Jello, berries, and cream for a fun, festive, and refreshing summer dessert.

Prep Time
45 min
Cook Time
25 min
Total Time
70 min

Category: Desserts

Skill Level: Easy

Cuisine: American

Yield: 15 Servings (1 large flag cake)

Dietary Preferences: Vegetarian

Ingredients

→ Cake Base

01 470 grams vanilla cake mix
02 240 millilitres water
03 3 large eggs
04 80 millilitres canola oil

→ Jello Layer

05 85 grams strawberry flavoured gelatin powder
06 240 millilitres boiling water
07 120 millilitres cold water

→ Topping

08 225 grams whipped cream
09 475 millilitres blueberries
10 1.4 litres strawberries

Steps

Step 01

Wash and thoroughly dry strawberries and blueberries. Gather and prepare all required ingredients.

Step 02

Combine vanilla cake mix, water, canola oil, and eggs in a large bowl. Mix until smooth using package directions.

Step 03

Pour batter into a greased 23 x 33 cm baking pan. Bake according to package instructions until cake is lightly golden and a toothpick inserted comes out clean.

Step 04

Remove cake from oven and allow to cool in the pan for 15 to 20 minutes.

Step 05

Whisk strawberry gelatin with boiling water in a heatproof bowl until dissolved. Stir in cold water until fully combined.

Step 06

Using a fork, poke holes evenly across the surface of the warm cake.

Step 07

Slowly pour the gelatin mixture evenly over the cake, allowing it to absorb into the holes. Let cake cool completely.

Step 08

Using a spatula, gently spread whipped cream evenly over the cooled cake.

Step 09

Arrange blueberries in rows on the top left corner to form the stars section. Stem and slice strawberries lengthwise, then lay in even rows to create red stripes.

Step 10

Cover the decorated cake and refrigerate for 3 to 4 hours. Slice and serve chilled.

Notes

  1. To make gluten-free, substitute with a suitable gluten-free cake mix and follow its specific batter preparation instructions.
  2. When spreading whipped cream, apply gently to avoid crumbling the cake’s surface.
  3. Store cake, covered, in the refrigerator for up to 2 to 3 days.

Required Equipment

  • Large mixing bowl
  • Electric mixer or whisk
  • 23 x 33 cm rectangular baking pan
  • Heatproof bowl
  • Spatula
  • Fork

Allergy Information

Double-check each ingredient to identify potential allergens and consult a healthcare professional if unsure.
  • Contains egg
  • Contains gluten (if not using gluten-free mix)
  • Contains potential dairy in whipped topping (verify if using non-dairy alternative)

Nutrition Facts (Per Serving)

These details are for informational purposes and don’t replace medical advice.
  • Calories: 267
  • Fat: 10 g
  • Carbs: 41 g
  • Protein: 4 g