Taco Shepherd’s Pie

Name: Taco Shepherd’s Pie
Prep time: 15 min
Cook time: 15 min
Total time: 30 min
Cuisine: American, TexMex
Ingredients: 3 cups mashed potato flakes; 1 pound ground beef; 1 medium onion, chopped; 1 can (14-1/2 ounces) diced tomatoes, undrained; 1 can (11 ounces) Mexicorn, drained; 1 can (2-1/4 ounces) sliced ripe olives, drained; 1 envelope taco seasoning; 1-1/2 teaspoons chili powder; 1/2 teaspoon salt; 1/8 teaspoon garlic powder; 1 cup shredded cheddar cheese, divided