1large egg yolk(save the extra white for another use)
½cupall-purpose flour,fluffed, spooned and leveled
¼tspbaking powder
⅛tspcoarse Kosher salt(if using table salt, use half the amount)
¼cupwalnuts or pecans,finely chopped
2tbspbutterscotch chips
2tbspsemi sweet chocolate chips
ice cream,for serving
Instructions
Preheat the oven to 350 F, and position a rack in the center of the oven. Lightly grease a mini 6-inch cast iron skillet with butter or non-stick baking spray. Make sure your skillet has a 1 1/2 - 2 inch depth, or the dough will spill over the edges.
In a small bowl, whisk together the melted butter, sugar, brown sugar, vanilla and egg yolk, until smooth.
Add the flour, baking powder and salt, and use a spatula to stir in the dry ingredients until combined. Stir in the chopped nuts, butterscotch chips and chocolate chips.
Spread the dough into the prepared pan. Bake for about 25-28 minutes, until the edges are puffed and golden brown, but the center of the cookie is slightly underdone. The center may fall during the last few minutes of baking, which is normal.
Let cool for 10 minutes, then serve warm with ice cream.