In a large bowl, stir together the oats, whole wheat flour, coconut, sweetener, cinnamon, and salt
Add ¼ cup yogurt and stir until the ingredients are somewhat moistened, then add the butter
Working quickly with your fingers, rub in the butter, until it is in small pieces about the size of your thumbnail (some pieces will be larger than others)
Break the topping mixture over the fruit, placing it so that the fruit is lightly and evenly covered (some fruit may show through)
Bake the crisp for 50-55 minutes, until the filling is bubbly at the edges and the top is light golden brown
Let rest for 5 to 10 minutes. Serve warm, topped with vanilla ice cream or yogurt as desired.