Sautè veggies: In a large skillet, over medium high heat, add 1 Tablespoon oil, 1 cup chopped zucchini, 1 cup chopped bell pepper and 1 cup diced onion. Cook 5 minutes, or until the vegetables are tender. Add 3 teaspoons minced garlic and cook an additional 1 minute.
Cook beef: Remove vegetables from pan and set aside, Add the 1 pound ground beef and cook for 7-9 minutes, or until fully cooked and browned. Drain grease.
Add ingredients: Turn heat down to medium low, add salt and pepper to taste, 2 Tablespoons taco seasoning, drained black beans, drained tomatoes, 1 cup corn and the cooked vegetables. Stir until combined and cook until heated through.
Melt cheese: Remove skillet from heat. Sprinkle 1 cup shredded cheese to the top and add lid. Let it rest for 2 minutes to melt the cheese.
Garnish: Remove lid, and serve with optional rice, sour cream, avocado and cilantro.