Spinach and Grilled Chicken Penne

Ingredients (9)

• ✓ 1 tablespoon butter
• + 1 tablespoon salt, or more to taste add to pantry
• ✓ 1 tablespoon ground black pepper, or more to taste
• ✓ 1 tablespoon garlic powder
• + 1 pound boneless skinless chicken breasts, cut into bite-size pieces add to pantry
• + 1 (14.6 ounce) package penne pasta add to pantry
• + 5 cups fresh spinach, or more to taste add to pantry
• + 1 cup grated Parmesan cheese add to pantry
• + 1 tablespoon red pepper flakes add to pantry