Peanut Butter and Chocolate Cheesecake Brownies

Position rack in center of oven and preheat to 325°F. Spray 9-inch square metal baking pan with 2-inch-high sides with nonstick spray; line bottom with parchment paper.

Stir chocolate and butter in medium saucepan over low heat until smooth; cool 10 minutes. Using electric mixer, beat sugar, eggs, and vanilla in medium bowl until very fluffy, about 3 minutes. Beat in chocolate mixture on low speed, then beat in flour and salt. Spread batter in pan.

Using electric mixer, beat cream cheese, peanut butter, and vanilla in medium bowl until smooth. Gradually add sugar, beating until fluffy. Beat in eggs 1 at a time. Beat in cream, then flour. Transfer 1/3 cup cheesecake batter to small bowl and reserve. Spread remaining cheesecake batter over brownie layer.

Place chocolate in small microwave-safe bowl. Microwave on low power in 10-second intervals until chocolate begins to melt, then stir until smooth. Mix chocolate into reserved 1/3 cup cheesecake batter. Drop chocolate batter by heaping teaspoonfuls atop cheesecake layer. Using chopstick or wooden skewer, swirl chocolate batter in figure-eight pattern through white cheesecake layer.

Bake brownies until edges of cheesecake layer are puffed and center is set, about 36 minutes. Cool brownies in pan on rack. Cover; chill at least 1 hour.

Cut brownies into 25 squares. Using narrow spatula, transfer brownies to platter. Serve cold.