2 cups milk (dairy, almond, soy, cashew--anything)

1 scoop protein powder (e.g., Dymatize Elite Whey Protein)

6 heaping tablespoons peanut butter

2/3 cup frozen blueberries

Agave nectar for swirling

Add milk, protein powder, peanut butter, and blueberries to blender. (If you need help with a "heaping tablespoon," see the picture above.)
Add agave nectar to the blender, to taste. I usually take three quick circular pours around the blender.
For thinner consistency: add milk in tablespoon increments.
For thicker consistency: add more fruit or peanut butter
For higher calorie: add an extra scoop of protein powder, 1/4 cup old-fashioned oats, and 2 tablespoons extra milk.