Ingredients
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125gm crunchy peanut butter
1 egg
80gm sugar (castor or demerara, it doesn't really matter)
something else. A handful of raisins, hard fudge or chocolate squares.
Prep
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Beat the sugar and egg together until creamy.
Mix with other ingredients until thoroughly combined.
Dollop cookie-sized lumps on baking paper on a tray, flatten out to 1/2" - 1/3" or so thick.
Cooking
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Bake in 180C oven for 10-12min until past golden brown.
Remove from oven, allow to cool for a bit, then peel off baking paper and complete cooling on a tray.
The resulting cookies are very durable - they'll survive bumping in a saddlebag. Being mostly peanut butter with sugar and egg, they are very high in calories.