
Step 1: Preheat
Heat the oven to 350°F and grease a 9×13 pan or line with foil.
Step 2: Make the Batter
Mix the cake mix, eggs and half the melted butter into a thick batter.
Step 3: Bake
Spread in the pan and bake 20–25 minutes until set. Do not overbake.
Step 4: Make the Frosting
Whisk the powdered sugar, cocoa, remaining butter and milk until smooth and pourable.
Step 5: Frost
Pour the frosting over the warm brownies and spread evenly.
Step 6: Set and Cut
Let the frosting set 30 minutes, then cut into squares.
Tips
- Frost while warm for that glossy, fudgy top.
- Add a pinch of salt to the frosting to balance the sweetness.
Storage
Covered at room temperature up to 4 days.
FAQ
Can I use any chocolate cake mix? Yes – devil’s food works great.








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