Combine the fruit and arrowroot powder in a bowl; toss to combine
Bake, covered for 30 minutes, or until the fruit releases some of it's liquid, and the mix has thickened slightly
Topping
Combine all of the topping ingredients in a food processor and pulse a couple of times.
If you like your topping a bit on the crumbly side, you can stop at this point. If you would prefer a dough-like consistency, pulse a few more times until a dough forms
Finish and Serve
Sprinkle the topping over the fruit and bake, covered, for an additional 25-35 minutes until the top is golden brown and the juices are bubbly.
Remove the foil and bake uncovered an additional 5 - 10 minutes
Let the crisp cool 20 minutes or so. Serve warm with Greek yogurt as a topping.