Snack

Baked Banana and Whey Oat Squares

Name: Baked Banana and Whey Oat Squares
Prep time: 10 min
Total time: 10 min
Yield: 6 servings
Ingredients: 120 g Rolled oats; 2 medium, about 200 g Banana; 2 large, about 110 g Egg; 100 ml Skimmed milk; 1 scoop, about 30 g Whey protein isolate; 1 tsp Baking powder; 1 tsp Ground cinnamon; A pinch Salt

Oats, mashed banana, eggs and milk baked into a tray and cut into six squares. Somewhere between porridge and cake. 157 kcal a square.

Calories: 157kcal
Protein: 10g
Fat: 3g
Carbs: 21g

Per serving, makes 6. 10 minutes of work, then 25 minutes in the oven. Published 8 September 2026.

Allergens

Gluten
Milk
Eggs

Oats count as a gluten cereal under UK labelling and ordinary oats are milled alongside wheat. Certified gluten-free oats are a separate ingredient here.
Most whey powders contain soya lecithin, which counts as soya. Check the tub.

Flags follow UK labelling rules and come from the ingredients as listed, not from any particular brand. Check the packet before cooking for somebody with an allergy.

Ingredients

Rolled oats120 g
Dry weight.
Banana2 medium, about 200 g
Peeled weight. A medium banana is about 100 g without the skin.
Egg2 large, about 110 g
Skimmed milk100 ml
Whey protein isolate1 scoop, about 30 g
Values for an unflavoured or lightly flavoured isolate. A concentrate or a blend carries more fat and carbohydrate at the same scoop.
Baking powder1 tsp
Ground cinnamon1 tsp
SaltA pinch

Method

Heat the oven to 180°C and line a 20 cm square tin or a small roasting tray with baking paper.
Mash the bananas well, then beat in the eggs and milk.
Stir in the oats, whey, baking powder, cinnamon and salt. Pour into the tin and bake for twenty-five minutes until the top is golden and a knife comes out clean.
Cool for ten minutes before cutting into six squares.

Worth knowing

Ripe bananas are the sweetness; there is no sugar in this. Spotty ones are noticeably sweeter than yellow ones.
The whey roughly doubles the protein of a plain baked oat. Leaving it out makes a slightly softer square with the same carbohydrate.

Other snack recipes that share ingredients with this one, or every snack under 300 calories a serving.

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Macros are calculated from the weights listed above using standard food composition values, and will shift with your own brands and measuring. Weigh what you can. This is a recipe, not dietary advice. The full health disclaimer is below.