Keto Philly Cheesesteak Skillet

Name: Keto Philly Cheesesteak Skillet
Ingredients: 1 tablespoon olive oil; 1 medium onion, halved; 2 teaspoons minced garlic; 1 cup diced green bell pepper; 1 pound ground beef; 1 teaspoon salt; ¼ teaspoon black pepper; ¼ teaspoon garlic powder; ¼ teaspoon onion powder; ½ cup beef broth; 1 pound cauliflower florets; 8 ounces sliced mushrooms; ¼ cup half and half; 10 slices provolone cheese