3 ounces frozen strawberries, or more to taste
1/3 cup orange juice
1/3 cup nonfat milk
1/4 cup vanilla Greek yogurt
1 1/2 tablespoons milled flax seed
1 tablespoon vanilla protein powder
1 ice cube
Blend strawberries, orange juice, milk, yogurt, flax seed, protein powder, and ice cube in a blender until smooth, 1 to 2 minutes.