This recipe produces 32 ounces of smoothie, about 500 calories. With the oatmeal and flax it's reasonably hearty.
Ingredients
1/2 cup oatmeal
2 tbsp ground flax
1 banana, frozen or fresh
2 cups frozen blueberries
1/2 tbsp agave nectar
2 cups unsweetened almond milk
Directions
Thoroughly grind the oatmeal in the blender.
Add the other ingredients and blend at medium until smooth (~90 seconds).
Drink immediately or refrigerate.