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BROWNIE LAYER:
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Preheat oven to 350 degrees F. Line bottom of a 9″ springform pan with parchment paper and spray paper and sides of pan with cooking spray (I use a baking spray, but you could use regular spray and lightly dust with flour instead).
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In a small saucepan, melt butter and chocolate until smooth, over low heat, stirring often.
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Turn off heat and whisk in sugar. Set aside to cool for 5-10 minutes, stirring often.
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To a mixing bowl, add in melted chocolate mixture, milk and eggs, whisking quickly so the residual heat doesn’t cook the eggs.
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Use a wooden spoon to stir in flour until just combined. Pour batter into prepared pan in an even layer, and bake for 25 minutes.
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CHEESECAKE LAYER:
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Remove brownie pan from the oven and set aside.
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Reduce oven temperature to 325 degrees F.
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Using a stand mixer (or hand mixer), beat all cheesecake ingredients together until mixture is smooth. Take care not to mix too quickly, or air bubbles will form.
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Pour cheesecake batter over brownie layer in pan.
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Bake for 50 minutes, until center is slightly jiggly (or when an instant read thermometer inserted into the center reads 150.
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Remove from oven and cool at room temperature, with the pan on a wire rack for 30 minutes to 1 hour.
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Place pan in the refrigerator for 4 hours, or overnight to chill and firm up to that amazing cheesecake consistency.
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COOKIE DOUGH LAYER:
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In a stand mixer (or hand mixer), cream together butter and both sugars on MED-HIGH speed until light and fluffy.
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Beat in sweetened condensed milk and vanilla extract.
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Beat in salt and flour. Stir in mini chocolate chips.
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Use an offset spatula to gently spread cookie dough over the top of the cooled cheesecake.
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This is done most easily when the spring has been undone and the cheesecake is free from the sides of the pan.
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If you can’t spread the cookie dough, gently press pieces together to “spackle” the cookie dough onto the cheesecake.
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FINISH THE CHEESECAKE:
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Microwave milk chocolate chips and vegetable oil in 30 second bursts (stirring each time), until nearly melted. Stir to melt remaining lumps.
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Drizzle melted chocolate over the top of the cheesecake.
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To slice, use a long, thin knife. Dip knife blade into very hot water, shake off excess and slice carefully. Between each slice, use a paper towel to wipe off cake crumbs and reside, then dip knife into the hot water again before slicing.