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This is a riff on my basic blondie recipe, with a few minor changes.

• 3/4 cup (1 1/2 sticks) unsalted butter, softened, plus more for pan
• 2 1/2 cups all-purpose flour
• 1 1/2 teaspoons baking powder
• 3/4 teaspoon salt
• 1 cup packed dark-brown sugar
• 1/2 cup white sugar
• 3 large eggs
• 1 teaspoon cinnamon
• 1 1/2 teaspoons pure vanilla extract
• 1 cup white chocolate chips
• 1 cup mini-semi-sweet chocolate chips

In a medium bowl, whisk flour, baking powder, and salt.

In a mixing bowl, cream butter and sugars until pale and fluffy. Add cinnamon. Mix in eggs and vanilla. Add flour mixture and mix on low until combined. (You may need to add 1-2 tablespoons of water if the batter is too thick.)