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Snack

Banana, Oat and Egg Mug Cake

Mashed banana, gluten-free oats, one egg and cinnamon, cooked in a mug. No milk and no nuts, and nothing added for sweetness. 248 kcal.

Calories
248kcal
Protein
11g
Fat
8g
Carbs
33g

Per serving, makes 1. 5 minutes of work. Published 8 September 2026.

Allergens

  • Eggs

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

  • Gluten-free oats30 g

    Dry weight. Certified, which is the only thing that separates them from ordinary oats in the numbers.

  • Banana60 g (about half)

    Peeled weight. A medium banana is about 100 g without the skin.

  • Egg1 large, about 55 g
  • Ground cinnamonHalf a teaspoon
  • Baking powderHalf a teaspoon
  • SaltA pinch

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Method

  1. Mash the banana in a large mug with a fork until there are no lumps bigger than a pea.

  2. Beat in the egg, then stir in the oats, cinnamon, baking powder and salt.

  3. Microwave on full power for ninety seconds to two minutes until risen and springy on top. Leave it a minute before eating; it is very hot in the middle.

Worth knowing

  • The banana is the only sweetness. A very ripe one makes a cake; a firm yellow one makes something closer to a savoury oat pudding.
  • The egg is most of the protein and all of the structure. With just the white it is lighter and a little lower in fat but falls apart more easily.

More like this

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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.