10 oz unsalted butter 9 5/8 oz all-purpose flour 1 1/2 teaspoons

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10 oz unsalted butter
9 5/8 oz all-purpose flour
1 1/2 teaspoons baking powder
1 1/2 teaspoons salt
15 oz brown sugar
3 1/2 oz sugar
3 eggs
2 1/2 teaspoons vanilla extract
1 cup chopped walnuts (about 4 ounces)
1 cup toffee bits

Line 9x13 pan with greased parchment.

Cook butter until golden brown; cool. Whisk flour, baking powder, and salt.

In mixer, combine browned butter and both sugars. Add eggs. Beat until light and fluffy. Add vanilla. Add flour mixture, walnuts, and toffee bits. Mix until thoroughly combined, and pour into pan.

Bake at 350 degrees until a tester inserted in the center comes out clean, 35 to 40 minutes (do not overbake).