We had this at Scott + Karen's and it was THE BEST.
Ingredients:
2 cups all purpose flour
1 tsp baking powder
1 tsp salt
1 cup melted unsalted butter
1 cup granulated sugar
1 cup brown sugar
4 large egg yolks
4 tsp vanilla
2 cups milk chocolate chips (and chopped mini peanut butter cups)
12 tbsp creamy peanut butter
Directions:
1. Preheat oven 350F, and butter 12inch cast iron skillet
2. In a medium bowl, combine flour, baking powder, salt + mix until well combined.
3. In a separate medium bowl, combine melted butter, brown sugar, white sugar, egg yolk, vanilla extract and mix until well combined.
4. Stir in the flour mixture.
5. Stir in the chocolate chips.
6. Transfer half the dough mixture to the cast iron skillet.
7. Add peanut butter in dollops around the dough mixture.
8. Add the remaining dough mixture so it covers the peanut butter and is evenly distributed.
9. Bake for 20-25 minutes or until edges are browned and centre is set.
10. Remove from oven and cool for 5 minutes.
11. Serve with ice cream.