Preheat oven to 350°.
Line a 9 x 9-inch baking pan with nonstick foil.
Whisk melted butter and brown sugar together in medium bowl until combined.
Add eggs and vanilla.
Fold in flour, salt, baking powder.
Fold in rolos.
Spread into pan and sprinkle on the chips.
Bake 27-30 minutes.
Cool and cut.