Step 1: Preheat your oven to 350°F. Line a 9”x13” baking pan with parchment paper and grease it with cooking spray. Prepare the brownie mixes according to the package instructions and pour both batters into the prepared pan. Bake until a toothpick inserted into the center comes out clean, about 40 minutes. Let the brownies cool completely.

Step 2: In a large bowl, use a hand mixer to beat the cream cheese until smooth. Add the powdered sugar and beat until there are no lumps. Then, add the vanilla extract and salt, and beat until everything is well combined.

Step 3: Make the ganache by placing the chocolate chips in a medium heatproof bowl. In a small saucepan over medium heat, bring the heavy cream to a boil. Pour the hot cream over the chocolate chips and let it sit for 5 minutes, then whisk until smooth. Let the ganache cool slightly.

Step 4: Remove the brownie from the pan and cut it in half widthwise. Then, cut each piece in half horizontally to make a total of 4 thin layers. Place one piece of brownie on a platter, then spread a thin layer of ganache on top. Add about one-third of the cream cheese filling, then top with another layer of brownie. Repeat these layers, ending with ganache on the final layer of brownie. Refrigerate for 1 hour or until well chilled.

Step 5: Before serving, top the brownie lasagna with chocolate shavings and drizzle with additional ganache. Enjoy your decadent dessert!