2 cups chopped fresh rhubarb
2 cups quartered fresh strawberries
1 cup fresh blueberries
1 cup fresh raspberries
3/4 cup xylitol (or sugar)
1 tablespoon plus 2 teaspoons cornstarch
1 tablespoon grated lemon zest
1 tablespoon lemon juice
1/2 teaspoon vanilla extract
OAT TOPPING:
1-1/2 cups old-fashioned rolled oats
1/2 cup white whole wheat flour
1/2 cup coconut sugar (or brown sugar)
3/4 teaspoon ground cinnamon
1/4 teaspoon salt
1 teaspoon vanilla extract
1/3 cup melted butter