Granola is one of my most favourite breakfasts to have on standby, usually sling in the bottom of an oven that already has something else going on in it, in order to utilise the hot air already swilling around in there to create something else, practically for free, from store cupboard ingredients. My Small Boy loves this with his milk warmed through and a few tiny marshmallows dotted in as a treat; a nod to the 1990s classic cereal Lucky Charms, but without all of the E numbers that send us both doolally. This also works sprinkled over ice cream, as a topping for a crumble or a trifle, or eaten from the jar with your hands.

Serves 8 from 8p each

2 tbsp light cooking oil, 3p (£3/3l, Sainsburys sunflower or vegetable oil)

4 tbsp peanut butter (or nut or seed butter of your choice), 17p (90p/340g, Sainsburys Basics)

4 tbsp strawberry or raspberry jam, 7p (40p/454g, Sainsburys Basics)

300g porridge oats, 36p (£1.20/1kg) – to make this recipe gluten free, simply use gluten free oats in place of these

First, preheat your oven to 160C.

Take two medium sized, microwave proof bowls. Pop the peanut butter in one and the jam in the other, and melt them both for 40 seconds on a high heat until liquid. Add a tablespoon of oil to each and stir.

Divide the oats in half and add to each bowl. Mix well to coat them with their respective mixtures.

Dollop the mixtures onto a baking tray, a teaspoon at a time, until the bowls are both empty. Pop the baking tray into the oven for 15-20 minutes. The jam may pool onto the tray and mix with the peanut butter – this is absolutely fine.

Remove from the oven when golden and jostle about with a spatula, palette knife or wooden spoon to stop it from sticking and setting as the jam cools. Allow to cool completely, then transfer to an airtight jar. Leave the lid off for a further hour just to be sure that no warm air will become trapped inside your jar, and then screw tight and shake gently to mix together.

The granola will keep for around 6 weeks if stored correctly, if it lasts that long in your house!

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PBJ Granola recipe by Jack Monroe

PBJ Granola recipe by Jack Monroe