In high-speed blender, add all ingredients except toppings. Whirl at high speed until smooth and creamy. For a thicker consistency, whirl in chia seeds. For a thinner consistency, add more chocolate milk.
Transfer to serving bowl and add your choice of toppings.
Per serving (if serving 2): 302 calories; 14 g protein; 16 g total fat (2 g sat. fat); 32 g total carbohydrates (12 g sugars, 9 g fiber); 89 mg sodium