High Protein Ground Beef Sweet Potato Skillet

Name: High-Protein Ground Beef & Sweet Potato Skillet
Ingredients: 1 tablespoon extra-virgin olive oil; ½ medium red onion , diced; 2 cloves garlic , minced; 1 pound lean ground beef; 2 medium sweet potatoes , scrubbed and diced ( 4 cups ); 2 medium green bell peppers , chopped ( 1 cup ); ½ teaspoon salt; ¼ teaspoon ground pepper