Preheat the oven to 350 degrees. Spray a 9 x 13 pan baking dish with cooking spray.
Heat the butter in a skillet over medium heat until it begins to brown. It will smell nutty.
Add in the eggs one at a time, beating after each addition. Stir in the vanilla. In a medium bowl combine the flour, baking powder, salt, cinnamon, and white chocolate chips.
Add the flour mixture to the butter mixture and stir well.
Spread into the greased pan and bake for 20-22 minutes. Remove from oven and cool completely on a wire rack.