Ingredients:

For the Shortbread Base:

• 1 cup (2 sticks) unsalted butter, softened
• 1/2 cup powdered sugar
• 2 cups all-purpose flour
• 1/4 teaspoon salt
• Zest of 1 lime

For the Key Lime Filling:

• 1 cup granulated sugar
• 4 large eggs
• 2/3 cup fresh key lime juice (you can also use regular lime juice)
• 2 tablespoons all-purpose flour
• 1/2 teaspoon baking powder
• Powdered sugar for dusting (optional)
• Lime slices for garnish (optional)