1 1/2 cups unsalted butter, softened
1 cup sugar
1 1/4 cup brown sugar, packed
1 1/2 teaspoons vanilla extract
3 large eggs
3 1/2 cups flour
1 1/2 teaspoons baking soda
1 1/2 teaspoons salt
1-1 1/2 cups chocolate chips (I used semi-sweet, but if you prefer a sweeter bar, milk chocolate would be good.)
1-1 1/2 cups butterscotch chips
1-1 1/2 cups white chocolate chips
Preheat oven to 375F.
Line a 17x12 (half sheet) pan with parchment paper and coat any surface not covered by the paper (edges) with cooking spray.
Beat the softened butter with the sugars until light and fluffy.
Add the eggs and extract and combine well.
Gradually, stir in the flour, baking soda, and salt.
Add the chips to the batter.
Spread in the prepared pan. Bake for 20-22 minutes, or until golden brown. DO NOT OVER BAKE.
Cool in pan completely before cutting. (4 dozen bars)