Yes, you can make this apple crisp ahead of time. Simply assemble the apple skillet as directed the night before you need to serve it. Then, cover with aluminum foil and refrigerate. To bake the apple crisp, heat the oven to 350°F. Remove the foil and place the skillet in the oven to cook for 35 - 40 minutes, until the apples are warmed through and the top is golden brown.