Preheat the oven to 350°F
In a large bowl, cream brown sugar, granulated sugar, unsalted butter, and vegetable oil. Add egg and beat until fluffy.
Add baking soda, salt, baking powder, vanilla extract, all-purpose flour and stir. Mix in milk chocolate chips.
Press the cookie mixture into a greased 8-9 inch pan or cast iron skillet. Bake at for 18-22 min. The edges should be browned and crisp while the middle is soft and gooey.
Serve immediately with a scoop or three of Vanilla Ice Cream.
