Preheat the oven to 350F and lightly grease a 10 inch skillet or baking pan. Set aside.
Chop the chocolate & set aside.
90 grams milk chocolate, 90 grams semi-sweet or bittersweet chocolate
Whisk together the flour, baking powder, baking soda, and salt. Set aside.
333 grams all purpose flour, 1 ½ teaspoons baking powder, ¼ teaspoon baking soda, ½ teaspoon fine sea salt
Separately, whisk together the melted butter, brown sugar, and granulated sugar until completely combined.
226 grams unsalted butter, 200 grams brown sugar, 100 grams granulated sugar
Add the peanut butter and whisk to combine, followed by the eggs and vanilla extract.
260 grams creamy peanut butter, 2 eggs, 2 teaspoons pure vanilla extract
Add the dry ingredients to the wet ingredients and gently fold until a few streaks of flour are remaining. Add the chopped chocolate and fold until combined and the flour is fully incorporated.
Spread the dough into an even layer in the prepared pan and bake for 40-45 minutes until set and golden brown.
Let cool slightly, top with ice cream, and dig in!