WHOOPIE PIES MADE WITH BOXED CAKE MIX
Soft cake-like cookie sandwiches with creamy filling!
🛒 INGREDIENTS (Makes about 10–12 whoopie pies)
FOR THE CAKE MIX COOKIES
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1 box cake mix (chocolate is classic, but funfetti, red velvet, spice, or vanilla all work)
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2 large eggs
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1/2 cup vegetable oil (or 1/2 cup melted butter for richer flavor)
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1/3 cup water OR milk (milk makes them softer and more tender)
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1 tsp vanilla extract (optional but recommended)
Optional Add-Ins for the Cookies
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1 tbsp cocoa powder (for deeper chocolate flavor)
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½ tsp espresso powder (enhances chocolate)
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2 tbsp sour cream (makes cookies extra soft and cakey)
FOR THE CLASSIC WHOOPIE PIE FILLING
Marshmallow Cream Filling
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1 cup marshmallow fluff/creme
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1/2 cup butter, softened
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1 1/2 cups powdered sugar
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1–2 tsp vanilla extract
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Pinch of salt
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1–2 tbsp milk or cream (as needed for consistency)
Optional Fillings
(More details in Variations section.)
🍰 INSTRUCTIONS — LONG STEP-BY-STEP
1. Prepare your baking trays
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Line 2 baking sheets with parchment paper or silicone baking mats.
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Whoopie pie batter spreads slightly, so parchment is best for clean edges.
2. Make the whoopie pie “cookie” batter
In a large mixing bowl:
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Add cake mix.
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Add eggs, oil (or melted butter), and water/milk.
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Add vanilla.
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Mix with a spatula or hand mixer on LOW until combined.
The batter will be thicker than cake batter but softer than cookie dough — a “soft-drop” consistency.
OPTIONAL (recommended for puffy, cakey whoopie pies)
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Stir in 2 tbsp sour cream
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Add 1 tbsp additional cake mix if batter seems too runny
3. Scoop the batter
Scoop 2 Tbsp portions onto the prepared baking sheets:
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Leave 2 inches spacing between each mound.
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Keep portions uniform so the sandwiches match nicely.
For perfectly round whoopie pies:
Use a small ice-cream scoop or cookie scoop.
4. Bake the cakes
Bake at 350°F (175°C) for 10–12 minutes.
Signs they’re done:
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Tops spring back when touched
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Edges look set but not browned
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Centers don’t jiggle
Do NOT overbake—they should be soft and fluffy.
5. Cool completely
Let the cakes cool on the pan for 5 minutes, then transfer to a rack.
They must be fully cool before filling so the frosting doesn’t melt.
⭐ MAKE THE FILLING (LONG VERSION)
In a mixing bowl:
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Beat butter until fluffy (1–2 min).
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Add marshmallow fluff; beat until smooth.
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Add powdered sugar gradually until creamy and thick.
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Add vanilla + pinch of salt.
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If needed, add 1–2 tbsp milk to adjust texture:
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Too thick → add milk
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Too thin → add more powdered sugar
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Filling should be:
✔ Thick
✔ Spoonable
✔ Not runny
✔ Spreadable without squeezing out too easily
6. Assemble the whoopie pies
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Pair up the cooled cakes by size.
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Pipe or spread 1–2 tbsp filling onto the flat side of one cake.
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Gently press the matching cake on top to form a sandwich.
Don’t squeeze too hard — you want a soft “fluffy” look, not a pancake.
7. Chill briefly (recommended)
Refrigerate assembled whoopie pies for 20–30 minutes to help them:
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Set
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Hold shape
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Get that classic tender, thick texture
They’re even better the next day!
⭐ FLAVOR VARIATIONS
1. Classic Chocolate Whoopie Pies
Use chocolate cake mix
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extra 1 tbsp cocoa
Filling: marshmallow cream vanilla filling
2. Red Velvet Whoopie Pies
Use red velvet cake mix.
Add 1 tsp vinegar for authenticity.
Filling: cream cheese frosting
3. Lemon Whoopie Pies
Use lemon cake mix
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lemon zest
Filling: vanilla frosting or lemon buttercream
4. Funfetti Birthday Whoopie Pies
Use vanilla or funfetti cake mix
Filling: vanilla buttercream with sprinkles mixed in
5. Chocolate Peanut Butter Whoopie Pies
Use chocolate cake mix
Filling: peanut butter buttercream (½ cup PB + ½ cup butter + 1–2 cup powdered sugar)
6. Pumpkin Spice Whoopie Pies
Use spice cake mix
Add ½ cup pumpkin puree
(Use only 1 tbsp water instead of ⅓ cup)
Filling: cinnamon cream cheese frosting
⭐ TIPS FOR PERFECT WHOOPIE PIES
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Use milk instead of water for richer, softer cakes
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For thicker cakes, refrigerate dough 10–15 minutes before scooping
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Don’t overbake! Dry cakes = cracked whoopie pies
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Match your tops and bottoms before filling
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Use a piping bag for neater filling
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Chill before serving for bakery-style texture
⭐ STORAGE
Room Temp
1–2 days in airtight container.
Refrigerator
Up to 5 days.
Freezer
Freeze individually wrapped (plastic wrap + freezer bag): up to 2 months.
Ingredients
* Pies
* 1 boxed cake mix ( different cake mixes...Chocolate, Lemon, Spice, Strawberry, Red Velvet)
* 3 eggs
* 1/2 cup water
* 1/2 cup oil
Filling
* 1 1/2 sticks unsalted butter, softened
* 1 1/3 cups Marshmallow Fluff
* 3/4 cup powdered sugar
* 2 oz. cream cheese, softened
* 1 1/2 tsp. vanilla
* 1/4 tsp. salt
INSTRUCTIONS
1. Preheat oven to 400
2. Line cookie sheet with parchment paper
3. In mixing bowl beat all ingredients on medium low speed until well combined
4. Drop by 2 tablespoonfuls onto cookie sheets, 2 inches apart
5. Bake 8-10 minutes, until puffed and toothpick inserted in center comes out clean
6. Cool on rack until completely cool
7. In mixing bowl, add butter, marshmallow, powdered sugar, cream cheese, vanilla, and salt
8. Beat until smooth
9. Put 1/2 of pies, flat side up, on a cool baking sheet
10. Mound about 1 1/2 tbls. filling in the center of each
11. Top with remaining pies, rounded side up, and press gently so filling spreads Keep chilled until ready to serve.

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