Heat 2 tablespoons oil in a large saucepan over medium heat. Add half the garlic and cook until beginning to brown, about 1 minute. Add broccoli, bell pepper and 1/4 teaspoon each salt and pepper. Cover and cook, stirring once or twice and adding 1 tablespoon water if the pot is too dry, until the vegetables are tender, 3 to 5 minutes. Transfer to a bowl and keep warm.