4 ingredient Pumpkin Frozen Yogurt

1 cup nonfat vanilla yogurt, strained
1 cup pumpkin puree
1 tablespoons granulated sugar
1 teaspoon pumpkin pie spice

Mix everything together in a large mixing bowl until completely combined. Churn the mixture in an ice cream maker for a few minutes until it is a smooth, cool consistency. Alternatively, place the bowl in the freezer and stir mixture every half hour until it reaches desired consistency.