Snack

Peanut Butter Protein Bars

Name: Peanut Butter Protein Bars
Prep time: 15 min
Total time: 15 min
Yield: 6 servings
Ingredients: 100 g Rolled oats; 2 scoops, about 60 g Whey protein isolate; 70 g (a generous 4 tbsp) Peanut butter; 3 tsp, about 21 g Honey; 60 ml Skimmed milk; 4 squares, about 20 g Dark chocolate, 85%; A pinch Salt

A no-bake tray of oats, whey and peanut butter with dark chocolate on top, cut into six. 14 g of protein and 204 kcal a bar.

Calories: 204kcal
Protein: 14g
Fat: 9g
Carbs: 16g

Per serving, makes 6. 15 minutes of work, then 2 hours in the fridge. Published 8 September 2026.

Allergens

Gluten
Milk
Peanuts
Soya

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.
Flagged for the soya lecithin most bars use. Most also say they may contain milk and nuts.

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 oats100 g
Dry weight.
Whey protein isolate2 scoops, about 60 g
Values for an unflavoured or lightly flavoured isolate. A concentrate or a blend carries more fat and carbohydrate at the same scoop.
Peanut butter70 g (a generous 4 tbsp)
The kind that is peanuts and salt. Sweetened spreads carry more carbohydrate.
Honey3 tsp, about 21 g
Skimmed milk60 ml
Dark chocolate, 85%4 squares, about 20 g
SaltA pinch

Method

Line a 450 g loaf tin with baking paper, leaving some hanging over the sides to lift the slab out later.
Warm the peanut butter and honey together in a pan over a low heat until loose, then take it off the heat and stir in the milk.
Mix the oats, whey and salt in a bowl, pour in the peanut butter mixture and stir until everything is coated and there is no dry powder left.
Press the mix into the tin firmly with the back of a spoon. Melt the chocolate in short bursts in the microwave and spread it over the top.
Chill for two hours until solid, lift out and cut into six bars.

Worth knowing

Press harder than feels reasonable. A loosely packed bar falls apart when it is cut, and the mix does not get another chance to bind.
The peanut butter and chocolate are the fat; the whey is nearly all of the protein. Two scoops in a six-bar tray is the level where the bars still taste of peanut rather than powder.

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.