5. Make Filling
While the pie shell bakes, peel skin away from sweet potatoes using your fingers or a paring knife. Add the potatoes to a large mixing bowl. Add the butter and stir until it has melted. Use a whisk to stir and mash the potatoes so they’re smooth.
Add in the cream, both sugars, baking spices, vanilla bean paste, cornstarch, and salt. Stir until the consistency resembles a purée. Taste and adjust the seasonings as needed. Add in eggs and stir to combine.