Heat the remaining 1 tablespoon oil in a large nonstick skillet over medium-high heat. Add the meatballs, reduce heat to medium and cook, turning occasionally, until browned all over, 4 to 6 minutes. Push the meatballs to the side of the pan, add garlic and cook, stirring, for 1 minute. Add tomatoes, crushed red pepper to taste, the remaining 3/4 teaspoon Italian seasoning and 1/4 teaspoon salt; stir to coat the meatballs. Bring to a simmer, cover and cook, stirring occasionally, until the meatballs are cooked through, 10 to 12 minutes more.