Fudge Brownie Muffins with Cheesecake Swirl

I have this great recipe of my mom's for fudge brownie muffins, and I was wondering what they'd be like with a little cheesecake topping. So, I put them together and...ta-da! They turned out wonderful; very pretty, rich, but not too sweet. I made 60 of these for a church function and they seemed to be a big hit with everyone. They freeze well too. 

Fudge Brownie Muffins with Cheesecake Swirl

Brownie 
1 cup butter or margarine

1/2 cup cocoa

4 eggs

2 cups sugar

2 tsp vanilla

1 1/2 cups flour

1 tsp cinnamon
1/4 tsp salt

Cheesecake
1 (8 ounce) package cream cheese, softened

1 egg

1/3 cup white sugar

Mini chocolate chips (optional)

1. Preheat oven to 325 degrees. Line 24 muffin cups with liners and lightly spray them with non stick cooking spray.

2. Place butter and cocoa in a glass bowl and microwave on high 1 minute for until butter melts; set aside.

3. Combine 4 eggs, 2 cups sugar, and vanilla in a large bowl. Add the butter and chocolate mixture, flour, cinnamon, and salt. Stir until blended.

4. In a medium bowl, beat the cream cheese, 1 egg, and 1/3 cup sugar until light and fluffy.

5. Fill muffin cups with brownie batter about half way full. Sprinkle on a few mini chocolate chips (if desired). Drop 1 TBSP of cheesecake batter into each muffin cup.

6. Using a toothpick, swirl a little of the brownie batter up into the cheesecake.

7. Bake for 25 minutes. Cool in pans for 10 minutes, then remove to racks to cool completely. Refrigerate leftovers.