High-Calorie Shake: 850 cals
Low-Calorie Shake: 350 cals

High-Calorie Shake Recipe:

Ingredients:
2 medium Bananas (120 cals per 100g)
1 scoop Whey Protein
30g Oats (optional for thickness)
2 Dates
1 tbsp Peanut Butter
250ml Full Cream Milk

Low-Calorie Shake Recipe:

Ingredients:
100g Apple (60 cals per 100g)
1 scoop Whey Protein
15g Oats (optional)
250ml Skimmed/Double Toned Milk

I hope this helped!