Preheat oven to 350 degrees° F.
Spray a mini-muffin tin with non-stick cooking spray.
In a large bowl add melted butter and stir in sugar. Beat in eggs and vanilla. Add flour, cocoa powder, baking powder, and salt, stirring until well combined.
Spoon into muffin tin about 3/4 full. Press 1 mini Rolo into each cup.
Bake for 12-15 minutes. Cool in tin for 5 minutes and remove to a wire rack to cool completely.
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