Step 1

Preheat the oven to 350 degrees F.

Step 2

Spray a 9x13-inch baking dish with nonstick spray.

Step 3

In a bowl, use an electric hand mixer to cream the butter and the brown sugar together until they are light and fluffy, about 5 minutes.

Step 4

Add the eggs to the butter mixture, one at a time, and beat after each addition.

Step 5

Add the vanilla to the butter mixture and beat until smooth.

Step 6

In a medium bowl, add the baking powder, the salt, 1 teaspoon of the cinnamon, the nutmeg, and the flour and whisk to combine.

Step 7

Add the flour mixture to the cinnamon mixture and stir until just combined.

Step 8

Pour the batter into the prepared baking dish and evenly spread it out with a spatula.

Step 9

In a small bowl, mix the sugar and the remaining cinnamon together.

Step 10

Sprinkle the cinnamon sugar over the batter.

Step 11

Bake the bars until they are set in the middle and a toothpick inserted into the center comes out clean, about 25-35 minutes.

Step 12

Let the bars cool completely.

Step 13

Slice and serve.