Red Velvet Brownies:
nonstick vegetable oil spray
1/2 cup (1 stick) unsalted butter, diced
3 ounces bittersweet chocolate, chopped
1-1/2 cup granulated sugar
3 large eggs
1 teaspoon vanilla extract
1/4 teaspoon kosher salt
1 ounce liquid red food coloring
1 cup all-purpose flour, sifted
1/2 teaspoon baking powder

Sparkly Cream Cheese Frosting:

8 oz. cream cheese, room temperature
4 tablespoons unsalted butter, room temperature
1 teaspoon vanilla extract
1-1/2 cup powdered sugar, sifted
white sparkles edible glitter (optional)