01 -
Chop the butter into pieces and toss it in a thick-bottomed pan on medium heat. Keep stirring while it melts, foams up, and eventually turns golden with a nutty smell. Take it off the heat right away and place it in a heatproof bowl to cool down.
02 -
As the browned butter sits, sift the flour, baking soda, and cinnamon into a medium-sized bowl.
03 -
Set your oven to 350°F (175°C). Put parchment paper into a 9×9 inch pan, making sure there’s extra hanging over the edges so you can pull the bars out later. Give it a light coat of cooking spray to prevent sticking.
04 -
In a bigger bowl, combine the cooled butter, mashed banana, light brown sugar, white sugar, eggs, and vanilla. Whisk thoroughly until smooth and everything’s blended nicely.
05 -
Carefully fold the dry mixture into the wet ingredients using a spatula. Stir gently just until they come together; don’t mix it too much.
06 -
Stir in the semi-sweet chocolate chips, milk chocolate chips, and toffee bits carefully, keeping them spread throughout the batter.
07 -
Pour the batter into your prepared pan, then smooth the surface using a spatula.
08 -
Spread extra toffee bits and chocolate chips evenly over the top, pressing them lightly into the dough.
09 -
Bake for 30 to 35 minutes. The bars should be slightly soft in the middle while the edges are firmer and golden.
10 -
Once out of the oven but still warm, sprinkle a bit more of the toffee bits and chocolate chips on the bars, letting them melt slightly into the top.
11 -
Let everything cool fully in the pan—this step is super important for the bars to set properly and hold their shape.
12 -
After cooling, grab the parchment paper edges to lift the bars out of the pan. Slice them into 9 squares, then enjoy.