In a large mixing bowl, combine 1 cup of heavy cream and beat it with an electric mixer until stiff peaks form, about 3–5 minutes.

In another bowl, mix 8 ounces of softened cream cheese, 1 cup of powdered sugar, and 1 teaspoon of vanilla extract until smooth and creamy.

Gently fold the whipped cream into the cream cheese mixture using a spatula.

Take a 9x13 inch dish and lay down a single layer of Birthday Cake Oreos.

Spread half of the creamy filling evenly over the Oreos.

Add another row of Birthday Cake Oreos on top of the filling.

Pour the remaining cream mixture over these Oreos, spreading it out evenly.

Sprinkle a generous amount of colorful sprinkles over the top layer of the cake.

Cover the dish with plastic wrap and refrigerate for at least 4 hours.

When ready to serve, slice the cake into squares.