Start by preheating your oven to 350 degrees. Then spray your 9x13 pan with cooking spray to prevent sticking.
Now you will start with your hand mixer or stand mixer and mix up the cake mix, eggs, oil, and tequila. Fold in the blackberries at the end.
Pour the cake mixture into the pan and bake for 30-35 minutes or until the cake is fully cooked.
Place cake on a cooling rack to cool.
Frosting directions
In a pan on the stove you will warm up your butter and milk in a saucepan and bring to a boil, stirring often.
Once it boils remove from the heat and stir in the confectioner sugar, tequila, and lime zest.
Spread the tequila glaze over the warm cake,
Using the blackberry sauce, pipe lines going horizontal across the top of the cake.
Then grab a sharp knife or butter knife, pull the knife going vertical to create the detailed work. Or if you don’t want to decorate you can drizzle the sauce over the whole cake!
Cut and serve your margarita cake for your family and friends.