Gluten Free Lemon Lime Bars

Name: Gluten Free Lemon Lime Bars
Prep time: 20 min
Cook time: 35 min
Total time: 55 min
Cuisine: American
Ingredients: 2 cups gluten free 1:1 flour; 1/2 cup powdered sugar; 2 tbsp cornstarch; 1/4 tsp salt; 3/4 cup cold butter (cubed); 4 eggs; 1 1/2 cup white granulated sugar; 1/3 cup half and half; 3 tbsp gluten free 1:1 flour; 1 tsp lemon zest; 4 tsp lemon juice; 1 tsp lime zest; 4 tsp lime juice; 1 drop green food coloring; more zest for topping; more powdered sugar for topping