For a richer flavor, use full-fat Greek yogurt. Toast the pecans in a dry skillet over medium heat for 5-7 minutes, or until fragrant, stirring frequently to prevent burning. This enhances their nutty flavor. The caramel-pecan sauce can be made ahead of time and stored in an airtight container in the refrigerator for up to 1 week. Reheat gently before serving. If you don't have an ice cream maker, you can still make this frozen yogurt! Simply pour the yogurt mixture into a freezer-safe container and freeze for 2-3 hours, stirring every 30 minutes to prevent ice crystals from forming. Fold in the pie crust pieces during the last stir. Adjust the sweetness to your liking by adding more or less sugar.