Crust

1. Preheat oven to 350 °F. Butter the bottom and sides of an 8-inch square baking pan then line with parchment paper. In the bowl of a stand mixer (or an electric hand mixer) beat the butter and sugar on medium-speed until creamy, about 5 minutes.
2. Add the flour and salt and mix on low-speed until just combined. The dough will be very crumbly. Transfer the dough to the greased baking pan and, using your hands, press evenly into a thin layer. Bake for 15 minutes or until the crust is golden.

Filling

1. While the crust is baking, prepare the filling: In the bowl of a stand mixer (or electric hand mixer) beat the eggs and sugar on medium-speed until just blended. Add the flour, orange zest, lime juice, tequila and buttermilk and beat on low-speed until smooth and creamy.
2. Pour the filling over the baked crust. Bake for 13-15 minutes or when the top is set and lightly browned around the sides. Allow bars to cool completely in the pan. Carefully remove from the pan and place on a cutting board. Cut into 8 equal bars, then dust with powdered sugar and garnish with lime wedges. Enjoy!