Ingredients 1 tablespoon olive oil 1 cup chopped onion 8 ounces 90% lean ground beef 3/4 teaspoon dried oregano 1 1/4 cups unsalted chicken stock 1/2 teaspoon salt 1/2 teaspoon black pepper 1 1/2 cups unsalted crushed tomatoes or tomato sauce 8 ounces uncooked whole-grain penne pasta 5 ounces fresh baby spinach 4 ounces preshredded […]
