Fudgy Gluten-Free Cream Cheese Brownies

["Using an electric mixer on high speed, beat cream cheese and sugar in a large bowl until smooth. Add egg and vanilla and beat until smooth.", "Preheat oven to 350u00b0F. Butter baking pan and line with 2 overlapping layers of parchment, leaving a 2"" overhang on all sides. Butter parchment.", "Whisk cornstarch, cocoa powder, coffee, and salt in a small bowl.", "Combine chocolate and 6 Tbsp. butter in a large heatproof bowl set over a pot of barely simmering water, stirring occasionally, until butter and chocolate are melted and smooth. Remove from heat, then stir in sugar and vanilla. Whisk in eggs, one at a time, then whisk in cornstarch mixture until smooth, about 1 minute.", "Transfer batter to prepared pan. Dollop cream cheese mixture over batter, then swirl into batter with a knife or spatula.", "Bake brownies until a toothpick inserted into the center comes out with a few moist crumbs attached, about 30 minutes. Transfer pan to a wire rack and let cool completely. Using parchment overhang, transfer brownies to a cutting board. Cut into 4 pieces lengthwise, then 4 pieces crosswise to make 16 bars.", "Brownies can be made 3 days ahead. Store in an airtight container at room temperature."]