Preheat & Prepare – Set your oven to 375°F. Take the pie shells out of the freezer so they can slightly thaw.
Cook the Sweet Potatoes – Bring a large pot of water to a boil. Slice the sweet potatoes in half lengthwise and place them in the boiling water. Cook for about 15 minutes, or until a fork easily pierces the flesh.
Prepare the Filling – While the potatoes are cooking, melt the butter in the microwave. In a large bowl, combine the melted butter, half-and-half, evaporated milk, sugar, eggs, vanilla, cinnamon, nutmeg, and salt. Use a hand mixer to blend the ingredients.
Mash the Potatoes – Drain the sweet potatoes and allow them to cool slightly. Peel off the skins, being careful not to burn your fingers. Add the sweet potatoes to the bowl with the other ingredients and mix thoroughly using the hand mixer until smooth. Stir in the key lime juice.
Prepare the Pie Shells – Prick the bottom of each pie crust 4-5 times with a fork to allow steam to escape and prevent bubbling.
Fill & Bake – Pour the sweet potato mixture evenly into the pie shells. Place them on the middle oven rack and bake for about 45 minutes, or until a toothpick inserted in the center comes out clean.
Cool & Serve – Remove from the oven and set the pies on a wire rack to cool for at least 1 hour before serving. Enjoy a slice of this classic soul food dessert!