Thankfully, I am no longer in that phase of life. Sodium 2,140g. 1/2 banana; 1/2 apple; 1/2 tablespoon cardamom; Directions. Strawberry Banana Oatmeal Smoothie – 327 Calories. Calories per serving of Banana Oat Smoothie. Percent Daily Values are based on a 2000 calorie diet. Serving Size : 1 cup. 4.6 from 15 votes. My Peanut Butter Banana Oatmeal Smoothie combines the best of both worlds and is morphed into a well-rounded breakfast thanks to yogurt, milk, and oats.