Lightly spoon flour into a dry measuring cup; level with a knife. Place flour and next 5 ingredients (flour through nutmeg) in a food processor; pulse 2 times or until blended. Add almonds; pulse 3 times or until almonds are chopped. Add egg; pulse 5 times or until mixture resembles coarse meal.
Combine blackberries, maple syrup, and nectarines in a bowl; toss to coat. Divide fruit mixture evenly among 6 (10-ounce) ramekins or custard cups; crumble oat mixture evenly over fruit mixture. Bake at 350° for 35 minutes or until bubbly. Serve with frozen yogurt.
Note: This recipe may also be made in a 1 1/2-quart casserole and baked for 35 minutes.