Key Lime Cupcake

Why I Love This Recipe
Oops.. made a mistake with these recipes and fixed the recipe now. I had the wrong directions with the ingredients. Oops! Must have been one of those months..
Ingredients You'll Need
Cupcakes:
1 cup all-purpose flour
3/4 cup self-rising flour (make your own--add 1-1/2 tsp. baking powder & 1/2 tsp. salt to 1 cup all-purpose flour)
1/2 cup unsalted butter, room temperature
1-1/4 cups sugar
2 large eggs
2-1/2 Tablespoons key lime juice (about 10 key limes) or regular lime juice
1 Tablespoon key lime zest (about 10 key limes) or regular lime zest
1/4 teaspoon neon green food coloring
3/4 cup buttermilk
Frosting:
1 8 - ounce package cream cheese, room temperature
1-1/2 cups powdered sugar
1/2 cup unsalted butter, room temperature
1 Tablespoon key lime zest (about 10 key limes) or regular lime zest
1/2 teaspoon vanilla extract
Directions
Preheat oven to 350 degrees. Line 2 cupcake pans with paper liners.
Combine flour, sugar, baking powder, and salt in a large mixing bowl. Add shortening, milk, and vanilla. Beat 7 egg yolks in a separate bowl, and add to dry ingredients along with the water, oil, vanilla and key lime rind. Mix with mixer at medium speed while scraping bowl until well blended. (approximately 2 1/2 minutes)
In another large mixing bowl, combine egg whites and cream of tartar. Mix at high speed 2 to 2 1/2 minutes or until egg whites are stiff.
Carefully fold flour mixture into egg whites until just blended.
Pour cupcake batter into paper liners until 1/2 to 2/3 full.
Bake for 20 to 25 minutes or until top springs back when touched lightly.
Cool cupcakes completely in pans then drizzle with key lime glaze.
To make key lime glaze combine 1 cup powdered sugar and 1 tablespoon melted butter in a small mixing bowl. Stir in 2 - 3 tablespoons of key lime juice until slightly thin glaze consistency is reached. Drizzle over key lime cupcakes.