1. Heat oven to 350 degrees Fahrenheit (175 degrees Celsius). Prepare eight four-inch (10-centimeter) disposable or silicone round pans.
2. In a large bowl, mix oats, sweetener of choice, and melted butter or oil until combined. Divide mixture between prepared pans (about a scant 1/4 cup each); press firmly to form an even crust.
3. Par-bake crusts for eight minutes or until golden brown. Remove from oven and cool completely.