I got this recipe from Cooking Light.
You can tint the cheesecake batter with two or three drops of red food coloring to give it a pink tinge, if you like. When swirling the cheesecake and brownie batters in step 4, don't disturb the bottom brownie layer. Cool these bars completely before serving.
Yield: 16 servings (serving size: 1 bar)
1 (8-ounce) block 1/3-less-fat cream cheese
1/3 cup granulated sugar
1/4 teaspoon peppermint extract
1 large egg
1 large egg white
1 tablespoon all-purpose flour
4.5 ounces all-purpose flour (about 1 cup)
1/2 cup unsweetened cocoa
1/2 teaspoon salt
1 1/2 cups packed brown sugar
1/4 cup canola oil
1/4 cup buttermilk
2 teaspoons vanilla extract
2 large egg whites
1 large egg
1. Preheat oven to 350°.
2. To prepare cheesecake batter, place cheese in a medium bowl; beat with a mixer at medium speed until smooth. Add granulated sugar and peppermint extract; beat well. Add 1 egg and 1 egg white; beat well. Add 1 tablespoon flour; beat mixture just until blended.
3. To prepare brownie batter, weigh or lightly spoon 4.5 ounces (about 1 cup) flour into a dry measuring cup; level with a knife. Combine 4.5 ounces flour, cocoa, and salt in a medium bowl, stirring with a whisk. Combine brown sugar, oil, buttermilk, vanilla, 2 egg whites, and 1 egg in a large bowl; beat with a mixer at medium-high speed until well blended. Add flour mixture to brown sugar mixture; beat at low speed just until blended.
4. Reserve 1/2 cup of brownie batter. Pour remaining batter into a 9-inch square baking pan coated with cooking spray. Carefully pour cheesecake batter over top; spread evenly to edges. Dot cheesecake batter with reserved brownie batter. Swirl top two layers of batters together using the tip of a knife. Bake at 350° for 26 minutes or until top is set. Cool completely in pan on a wire rack.
These are soooooo good. I love the suggestion to use the pink food coloring. Perfect for Valentine's Day. The only thing I may change is to add a little more peppermint flavoring. These have a very mild peppermint taste so they're perfect if you just like a little hint of peppermint.