Marble Cheesecake Brownies
One 8-ounce package cream cheese (regular or low-fat, but not fat-free), softened
1 1/3 cups sugar
3 large eggs, at room temperature
2 large egg yolks, at room temperature
1 tablespoon plus 1 teaspoon vanilla extract
12 tablespoons (1 1/2 sticks) unsalted butter, plus additional for the pan, at room temperature
6 ounces bittersweet or semisweet chocolate, chopped, or semisweet chocolate chips
3 ounces unsweetened chocolate, chopped
3/4 cup all-purpose flour, plus additional for the pan 1/2 teaspoon salt
What you do:
In a large bowl, beat the cream cheese and 1/3 cup sugar with an electric mixer at medium speed until the sugar has dissolved and the mixture is smooth, about 4 minutes, scraping down the sides of the bowl as necessary. Beat in 1 egg and 1 teaspoon vanilla until well combined. Set aside.
Position the rack in the lower third of the oven. Preheat the oven to 350°F. Butter and flour a 9-inch square baking pan; set it aside.
Place the butter and both kinds of chocolate in the top of a double boiler set over simmering water. If you don't have a double boiler, place the butter and both kinds of chocolate in a heat-safe bowl that fits snugly over a small pot of simmering water. Stir constantly until half the butter and chocolate is melted. Remove the top of the double boiler or the bowl from the pot; then continue stirring, away from the heat, until the butter and chocolate are completely melted. Transfer the mixture to a large bowl and allow to

for 10 minutes.
(To melt butter and chocolate in a microwave, see pages 9-10.)
Beat the remaining 1 cup sugar into the melted chocolate with a whisk or with an electric mixer at medium speed; continue beating until the mixture is smooth and silky, about 5 minutes by hand or 2 minutes with a mixer. Beat in the remaining 2 eggs, 2 egg yolks, and 1 tablespoon vanilla until incorporated.
With a wooden spoon or a rubber spatula, stir in the flour and salt just until combined. Do not beat. Spread three-quarters of this chocolate batter into the prepared pan. Cover with the cream cheese mixture, spreading it as evenly as possible with a spatula. Do not press down. Dot the cream cheese mixture with the remaining chocolate batter, using heaping tablespoons of batter.
To create a swirl effect in the brownies, run a sharp kitchen knife through the batter without touching the bottom of the pan or lifting the knife up during its course. Slice through the chocolate dollops and drag some of the mixture into the cream cheese. Continue swirling until a spin-out, almost psychedelic pattern has formed.
Bake for 35 minutes, or until a

hpick or cake tester comes out clean. Set the pan on a wire rack to

for at least 30 minutes.
Cut the brownies into 16 squares while they're still in the pan. Carefully remove them with an offset spatula. Serve immediately, or let

completely before covering with plastic wrap for storage at room temperature. They will stay fresh for up to 4 days. The brownies can be tightly wrapped in wax paper, sealed in a fireezer-safe bag, and frozen for up to 3 months; allow them to thaw at room temperature before serving.