Blackberry-Peach Slow Cooker Crumble

INGREDIENTS

1 cup

old-fashioned rolled oats

3 oz

white whole-wheat flour (about 3/4 cup)

1/2 cup

packed light brown sugar

2 tsp

ground cinnamon

1/2 tsp

ground nutmeg

1/2 tsp

kosher salt

1/2 cup

unsalted butter, melted and cooled to room temperature

Cooking spray

3 lb

peaches, peeled and cut into 1-in. slices

3 cups

blackberries (about 14 oz.)