INGREDIENTS
1/2 cup
unsalted butter, room temperature, plus more for pan
2 1/4 cups
all-purpose flour
2 1/4 tsp
baking powder
1 tsp
coarse salt
1 1/2 cups
packed dark-brown sugar
3
large eggs
1 tsp
pure vanilla extract
1 cup
miniature marshmallows
1 cup
semisweet chocolate, coarsely chopped
1 cup
white chocolate, coarsely chopped
1 cup
butterscotch chips
18
soft caramel-candy cubes, coarsely chopped