200g peanut butter (crunchy or smooth is fine)
175g golden caster sugar
75g dark chocolate, chopped into chunks
1 large egg
For the ice cream
3 bananas, peeled, chopped and frozen in advance
2 tbsp double cream
1 tsp vanilla essence
Heat oven to 180C/160C fan/gas 4 and line two large baking sheets with baking parchment. Put the peanut butter, sugar, 1/4 tsp fine table salt and chocolate chunks in a bowl and mix well with a wooden spoon. Crack in the egg and mix again until the mixture clumps together and forms a dough.
Break off chunks of dough (about the size of a cherry tomato) and arrange them, spaced apart, on the sheets. Press the cookies down with the back of a fork to squash them a little. Can be frozen for up to two months – to cook from frozen,
add an extra 1-2 mins to the cooking time. Bake for about 12 mins until golden around the edges and paler in the centre. Leave to cool on the trays for 5 mins.
Meanwhile, put the bananas, cream and vanilla in a food processor and blend until they make a thick ice cream. Scoop into balls with an ice cream scoop and sandwich between the cookies. Serve immediately.