Step 1
Preheat oven to 350 degrees F.
Step 2
Add the flour, baking soda, baking powder, and salt to a mixing bowl. Stir with a whisk to combine. Reserve.
Step 3
In another large mixing bowl, whisk together the melted butter and sugars until combined. Add the eggs and vanilla, and stir to combine. Switch to a wooden spoon and stir in the flour mixture. Fold in the butterscotch chips, chocolate chips, and cashews.
Step 4
With a spatula, scrap the batter into a lightly greased 8 x 8-inch in pan or glass baking dish. Smooth to distribute evenly. Bake for 30 minutes, or until the top is golden brown and a toothpick inserted in the center comes out clean. Cool before cutting into 9 bars.
