Preheat your oven to 375°F (190°C). Gather your mixing bowls and measuring utensils.

In a medium bowl, beat the large eggs until frothy. Incorporate the granulated sugar, cornstarch, ground cinnamon, and apple butter, mixing until unified.

Gradually whisk in the whole milk, ensuring the mixture remains smooth.

Fit the pie crust into a 9-inch pie dish, pressing it gently to cover the bottom and fluting the edges.

Pour the prepared apple butter filling into the crust, spreading it evenly.

Bake for 60–65 minutes, keeping an eye on it. The center should jiggle slightly but be nearly clean when checked with a knife.

Once baked, allow the pie to cool on a wire rack before refrigerating for a few hours before serving.