Preheat oven to 350 degrees F.
Mix together all ingredients for crust, and spread evenly across the bottom of a 9x9 baking pan.
Bake for 15 minutes or until a light, golden brown color.
Remove from oven and let cool. While cooling, prepare filling.
Zest and juice the limes.
Combine eggs, sugar, lime zest, lime juice, flour, and tequila. Whisk until combined.
Pour on to cooled crust, and place back in the oven for 30 minutes, or until center is firm and does not jiggle.
Remove from oven and let cool.
Garnish with powdered sugar and lime zest, and enjoy!