01 -
Set your oven to 350°F (175°C). Grease a 9×13-inch baking dish or line it with parchment paper.
02 -
In a large bowl, combine melted butter and brown sugar. Stir until smooth. Add eggs and vanilla extract, then mix until fully combined.
03 -
Stir in flour, baking powder, and salt. Mix just until the ingredients are combined—do not overmix.
04 -
Gently fold in the butterscotch chips and toffee bits until evenly distributed throughout the batter.
05 -
Spread the batter evenly in the prepared pan. Bake for 25–28 minutes, or until golden on top and the edges begin to pull away from the sides.
06 -
Let the bars cool completely in the pan. For cleaner cuts and gooier texture, slightly underbake and refrigerate before slicing. Use a sharp knife to cut into bars.