To make the topping, put everything in a bowl and mix together with your fingers until it has a coarse crumbly texture. Keep breaking apart the butter into smaller and smaller bits, and combining everything until it has been thoroughly mixed.
Fill a mug or small bowl with pieces of fruit. Top with the crumble. I like to mound the fruit and topping up fairly high because it shrinks down as it cooks.
Set the bowl on a saucer to catch any drips, and microwave for approximately 2 minutes. It could take slightly less time.
Enjoy right away with a dollop of yogurt, creme fraiche, whipped cream or ice cream.
Nutritional information is provided as a courtesy and is an estimate only. This information comes from online calculators. Although The View from Great Island attempts to provide accurate nutritional information, these figures are only estimates.
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