Ingredients
Scale
- 1 box (15.25 oz) chocolate cake mix
- 8 tablespoons (1 stick) unsalted butter, melted
- 1 large egg
- 1 teaspoon vanilla extract
- 1/4 cup unsweetened cocoa powder
- 24-30 mini marshmallows
- Optional: 1/4 cup chocolate chips mixed into the dough
Instructions
- Preheat your oven to 350°F. Line two baking sheets with parchment paper or silicone mats.
- In a large bowl, combine the chocolate cake mix, melted butter, egg, vanilla extract, and cocoa powder. Mix until a thick dough forms. It’ll be pretty dense—that’s what you want.
- Scoop the dough into balls about 1.5 tablespoons each. Roll them smooth between your palms.
- Place the dough balls on your prepared baking sheets, spacing them about 2 inches apart. They’ll spread a bit while baking.
- Press one mini marshmallow into the center of each cookie. Push it down so it’s mostly buried but still visible on top.
- Bake for 10-12 minutes. The edges should look set but the centers will still seem slightly underdone. The marshmallows will puff up and get lightly golden.
- Let the cookies cool on the baking sheet for 5 minutes before moving them to a wire rack. They’ll firm up as they cool.
- Prep Time: 10 minutes
- Cook Time: 12 minutes
