Peanut Butter Swirl Brownies

1/3 c vegetable oil
2 eggs
1 box brownie mix
1 c peanuts, chopped

Peanut Butter Filling
1 1/4 cups (14oz can) sweetend condensed milk
1/2 cup peanut butter

Preheat oven to 350. Lightly grease 13x9" pan. In a medium bowl, stir together brownie mix and peanuts; stir until moistened Press half of the brownie mixture into the pan, reserving the remainder for topping.
Make the filling by stiring sweetened condensed milk and peanut butter in a medium bowl until smooth. Spread evenly over the brownie layer in the pan.
Drop rounded teaspoonfuls of the reserved brownie mixture over the peanut butter layer.
Bake for 25-30 min or until the top is set. Cool thoroghly before cutting.