Cookie Butter Blondies

Directions

1. 1
   Preheat your oven to 325°F. Grease a 9-inch square (or an 8-inch square) baking pan and line the pan with parchment paper or foil.
2. 2
   Melt the butter, and set aside to cool slightly (it doesn't need to cool fully, it just shouldn't be hot).
3. 3
   In a large bowl or a stand mixer, combine the melted butter, sugar, eggs and egg yolk, cookie butter, vanilla, and salt. Mix until smooth and well-combined (if your cookie butter is very thick and stiff, it helps to heat it for a few seconds in the microwave so it's easier to incorporate).
4. 4
   Add the flour and baking powder and mix until just combined. Mix in the chocolate chips.
5. 5
   Pour the batter into your prepared pan and smooth the top. Bake for 30 minutes (if using an 9-inch square pan) or 40 minutes (if using an 8-inch square pan). The bars should start to brown on the edges and a tester inserted in the center should come out clean, or with just a few moist crumbs clinging to it.
6. 6
   Remove from the oven and let cool fully before lifting out of the pan and slicing.