Preheat the oven to 325 degrees Fahrenheit. Butter a 10-inch tart pan, and set aside.
In a large bowl, beat the melted butter and sugar. Add the eggs and vanilla, and whisk to combine. Stir in the oil and cocoa powder just until smooth.
5 Tablespoons unsalted butter, 1 1/4 cups granulated sugar, 2 large eggs, 1 teaspoon vanilla extract, 1/3 cup vegetable oil, 3/4 cup unsweetened cocoa powder
Using a rubber spatula, stir in the pancake mix and salt until just combined. Gently fold in the chocolate chips.
1/2 cup buttermilk pancake mix, 1/4 teaspoon salt, 3/4 cup semi-sweet chocolate chips
Pour the batter into the prepared tart pan, spreading it out evenly.
Bake 20-25 minutes or until the batter is set and a cake tester can be inserted into the center and removed with just a few moist crumbs attached. Be careful not to overcook! Set aside to cool.
In a separate large bowl, beat the cream cheese and sugar until smooth. Add the whipped topping and vanilla, and beat again until fluffy.
8 ounces cream cheese, 3/4 cup powdered sugar, 8 ounces whipped topping, 1 teaspoon vanilla extract
Spread the whipped mixture over the brownie, and arrange sliced berries on top. Serve immediately.
Optional: sliced strawberries for garnish
Store brownie and whipped topping in separate containers in the fridge for up to 3 days.