Mix together graham cracker crumbs, melted butter and sugar for the crust. Press into the bottom of a 9 inch spring form pan, or 9 inch square baking dish. Bake for for 8 minutes.
Cream butter and sugar together for 2-3 minutes until it is light and fluffy.
Beat in eggs, 1 at a time, until fully incorporated. Add vanilla and mix until blended.
Add flour and baking powder, stir until just combined.
Add margarita mix (or your liquid of choice) and mix until smooth.
Pour into baked curst and bake for 35-40 minutes until the top is just golden, it springs back when you touch it, and a tester comes out clean.
Remove the cake from the oven and let it cook completely before topping.
To make the topping beat heavy cream until stiff peaks. Add in powdered sugar and margarita mix/lime juice until well combined.
Spread over the cooled cake. Top with the zest of 1 lime.
Notes
You need 3/4 up total liquid. If you don't have margarita mix, you can use 1/4 cup lime juice, 1/2 cup milk. Want to add tequila? Use 1/2 cup margarita mix, and 1/4 cup tequila.Recipe Adapted from Betty Crocker