Heat oven to 375°F. Fit dough into a 9-inch pie plate and crimp edges.
Line crust with foil and fill with pie weights. Bake 10 minutes.
Remove foil and weights. Bake 3 minutes more. Reduce oven to 350°F.
Whisk granulated sugar, brown sugar, flour, salt, and cinnamon in a saucepan.
Slowly whisk in heavy cream and milk until smooth and lump-free.
Cook over medium heat, whisking often, until thick and bubbling, 6–8 minutes.
Remove from heat. Whisk in butter and vanilla until silky and glossy.
Pour filling into warm crust. Smooth the top and dust lightly with nutmeg.
Bake at 350°F until edges are set and center jiggles slightly, 22–28 minutes.
Cool 1 hour on a rack. Chill at least 2 hours before slicing.
Notes
For a caramelized finish, sprinkle a spoonful of sugar over the cooled pie and gently torch until glassy. Prefer richer texture? Swap the milk for more heavy cream. Store covered in the refrigerator up to 3 days; serve cold or at cool room temperature.This recipe is an original creation inspired by classic Old-Fashioned Sugar Cream Pie Recipe flavors. All ingredient ratios and instructions are independently developed.