Yellow Cake Mix Cookie Bars made using butter, oil, eggs, a cake mix & plenty of chocolate! Simple recipe that transforms yellow cake mix into delicious cookie bars!

I love making recipes that transform a cake mix because they’re so simple! These chewy cookie bars require just 5 ingredients and are heavenly. Perfect for a family dessert, potluck or any type of gathering.
Ingredients for Cake Mix Cookie Bars
Cake mix: Use one 13.25-oz box of yellow cake mix for amazing texture and flavor.
Oil: Give the dough moisture by adding ¼ cup of oil.
Butter: For rich, chewy cookies, you need 4 TBSP of butter, melted.
Eggs: Bind the dough with 2 eggs.
Chocolate: Adding 1 cup of semi sweet chocolate chips and ½ cup of chocolate chunks gives the cookie bars varied texture and great chocolate flavor.

Tips for Chewy Cookie Bars
Full instructions in the recipe card below, but here are a few tips for making the most amazing cookie bars.
- Choosing the Best Yellow Cake Mix: Select a yellow cake mix that is neither too light nor overly sweet. Brands like Betty Crocker or Pillsbury offer reliable texture and flavor.
- Mixing Techniques for Cookie Bars: Combine the ingredients until the dough is thick but evenly mixed. Use a spatula or wooden spoon and avoid over-mixing, which can make bars tough. The dough should be dense, similar to cookie dough.
- Chocolate Chip and Chunk Variations: Use a combination of semi-sweet chocolate chips and chunks for varied texture and melt. Chips hold their shape while chunks create gooey pockets. You can substitute dark or milk chocolate, but semi-sweet balances sweetness with richness.

How long are Chocolate Chip Cake Mix Cookie Bars good for?
Store the cookie bars in an airtight container at room temperature. They will stay fresh for up to 5 days this way. Use parchment or wax paper between layers if stacking bars.
For longer storage, freeze the bars wrapped tightly in plastic wrap, then place them in a freezer-safe bag. They keep well for up to 2 months. Thaw at room temperature before serving.
Reheat bars in the microwave for about 15 seconds to restore softness. Avoid reheating too long to prevent dryness. This method preserves the gooey texture and chocolate melty quality.
Can you modify a cake mix to create unique cookie bar flavors?
You can add spices such as cinnamon or nutmeg to the batter for warmth and depth. Using vanilla, almond, or coconut extract changes the flavor profile without altering the recipe structure.
Mix in nuts, dried fruit, or different types of chips like peanut butter or butterscotch to enrich texture and taste.

Are there flavor variations for these cake mix cookie bars?
Yes, you can use different cake mix flavors like chocolate, lemon, or funfetti. Each will bring its own character to the bars while following the basic mixing and baking steps. You can also try flavored cake mixes such as chocolate or red velvet to vary the taste.
Tips for ensuring cake mix cookie bars come out soft and chewy
Use a combination of melted butter and oil to add richness and moisture. Butter improves flavor, while oil helps maintain softness.
Do not overbake; remove the bars from the oven once the edges set but the center is still slightly soft.
Press the batter evenly into the pan to ensure uniform cooking. Using parchment paper or greasing the pan well helps with easy removal without breaking.

Try more cake mix cookies here:
- Soft, chewy, and packed with rich peanut butter flavor—these easy Cake Mix Peanut Butter Cookies come together in minutes with just a few ingredients.
- Cozy and warm with hints of cinnamon, these Cake Mix Snickerdoodles are perfect for fall baking.
- Ultra rich and fudgy, these Chocolate Stuffed Cake Mix Cookies are a chocoholic’s dream, made with minimal effort.
- Bright, tangy, and incredibly easy to make with just a handful of ingredients. These Cake Mix Lemon Oreo Cookies are perfect for spring and summer!
- Pretty in pink and bursting with fruity flavor—these Strawberry Cake Mix Sandwich Cookies are a hit for Valentine’s Day or baby showers.
- Soft, chewy, and rich with cocoa flavor, these Red Velvet Valentines Cake Mix Cookies taste like your favorite red velvet cake in cookie form.
Yellow Cake Mix Cookies are made with just a few ingredients and packed with sweet, chocolatey flavor! An easy way to turn a boxed mix into soft, chewy cookies!
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