Preheat the oven to 350°F. Place 1 unbaked 9-inch premade pie crust into a 9-inch pie pan. Crimp the edges as desired and refrigerate while preparing the filling.
In a large mixing bowl, beat together 8 ounces softened cream cheese and 1 cup packed brown sugar until light and fluffy, about 3–4 minutes.
Add 3 large eggs, one at a time, beating well after each addition until fully incorporated.
Reduce the mixer speed to low and add 1¼ cups half and half, ¼ cup all-purpose flour, 3 tablespoons ground cinnamon, 2 teaspoons vanilla extract, and ¼ teaspoon salt. Mix until smooth and fully combined.
Pour the cinnamon filling into the prepared pie crust.
Bake for 35–40 minutes, or until the edges are set and the center is still slightly jiggly.
Remove the pie from the oven and allow it to cool completely at room temperature. The center will continue to set as it cools.
Cover the pie and refrigerate for at least 2–4 hours.
About 1 hour before serving, remove the pie from the refrigerator and allow it to come closer to room temperature.
Lightly dust the top of the pie with powdered sugar before slicing and serving.
Slice into 8 servings and enjoy.
Notes
This pie can easily be made the night before serving. Refrigerate any leftover pie covered for up to 5 days.