Classic Rhubarb Crisp

Preheat the oven to 350°F.

Make the filling: Chop the rhubarb into ½ inch pieces. Mix it with the granulated sugar, cornstarch, orange zest and vanilla extract in a bowl, then pour the filling into a round 9-inch pie pan, 9 x 9 inch baking dish or 7 x 11 baking dish.

Make the topping: In a medium bowl, mix together the oats, flour, sugar, cinnamon, and kosher salt . Cut the butter into small pieces and then use your hands to mix it into the oats until fully distributed and a crumbly dough forms. It may take a while so be patient; you can also use a fork or pastry cutter if you prefer. (If using coconut oil, it can be room temperature; use the same method to add it.) Pour the crumble on top and smooth it into an even layer with your fingers.

Bake: Bake for 45 to 50 minutes until the top is evenly golden brown and the filling is bubbly. Cool for 30 minutes to 1 hour, then serve warm. You can leave out your crisp on the counter for up to 1 day (covered, at night) so the crisp topping can stay crisp. After 1 day, refrigerate any leftovers. This crumble also freezes well for several months in a sealed container; reheat it in a 350°F oven until bubbly and the topping is crisp.