I've been experimenting with making a crisp in the microwave. I'm still tweaking, but this is essentially what I've come up with so far.
Peel, core, and slice about 2 1/2 small McIntosh apples. Place them in a microwave-safe dish. (I use a 2-cup bowl.) I'm a great believer in the maxim "Don't muzzle the ox that treads out the corn," so I taste a little of 3 apples as I go along and, that way, end up with the right amount, leaving enough room for a crust. In a separate bowl melt 3 1/2 TB salted butter. Add to that 2 TB sugar, 2 TB plain flour, 2 graham crackers crushed with your hands, 4 TB quick oats. Stir together with a large spoon, crushing any large crumbs of graham cracker. If you want, sprinkle just a smidgen of cinnamon over the apples. Put the topping over the apples and microwave on high 2 minutes. (My microwave is 1200 watts.) Voilà! (Serves 2 or 3.)
I've done this a couple of times with frozen blueberries as well, but I'm still working on that. The first time, I thought I should nuke the berries a minute before adding the crust. When I did that, the 2 additional minutes made the juice of the berries boil up into the crust. It still tasted great eaten right away, but I thought it might result in a bit of a soggy crust if it sat for a while. The next time, I just did 2 minutes with the crust and berries together, straight from frozen, but I ended up with some juice floating in the bottom of the bowl. One difference with the blueberries is that I sprinkle just a little sugar over the blueberries since they are more tart than the apples. I might try sprinkling just a wee bit of flour with the sugar.
If you try it, let me know how it turns out for you.