Add sugar, eggs and pumpkin spice extract to saucepan and stir to combine.TIP: Need brownies immediately and don't have pumpkin spice extract? Try subbing vanilla extract with a pinch of pumpkin pie spice!
Stir in flour, baking powder and salt.
Pour batter into greased 9" x 13" pan.
Oreo Cheesecake Topping
In a medium bowl, add cream cheese.
Using an electric mixer on medium speed, beat until smooth.TIP: Starting with softened cream cheese and beating it by itself at first insures no lumps!
Add sugar, pumpkin spice extract and egg and mix until combined.
Spoon cheesecake topping in large dollops over brownie batter, leaving some batter visible.TIP: Make sure the tip of your knife only goes through the top half of your batter so you don't scratch your baking pan!
Sprinkle surface of brownies with crumbled Oreos.
Bake 23-25 minutes or until a toothpick inserted into middle removes cleanly.