Whole Grains and Breads. To boost the carbohydrates in your breakfast, add a serving of whole grains or a slice of bread. A bowl of oatmeal made with 1/3 cup of dry oats has 102 calories, 19 grams of carbohydrates and 1.75 grams of fat. Other low-fat whole grains with plenty of carbs include barley, bulgur and couscous. Whole-grain breads offer another carbohydrate-rich breakfast if you don’t enjoy hot cereal. A large slice of multi-grain bread has 109 calories, 18 grams of carbohydrates and 1.7 grams of fat.