Preheat the oven to 375°F. Line a baking sheet with parchment or foil.
Use a sharp knife to pierce the sweet potatoes 3-4 times. Place on baking sheet. Bake for 60-70 minutes or until fork tender. Lower the oven temperature to 350°F.
Allow sweet potatoes to rest just until they're cool enough to handle. Use a teaspoon to remove the insides.
Add sweet potato flesh to a large bowl with the evaporated milk, brown sugar, melted butter, eggs, pumpkin pie spice (or cinnamon) and salt. Using an electric mixer on medium speed, whip until smooth.
Spray a 2 quart casserole dish (11x7-inch) with cooking spray. Pour sweet potato mixture into the prepared dish and spread evenly.
Streusel Topping: In a medium bowl stir together the flour, brown sugar, pumpkin pie spice (or cinnamon) and salt. Using a pastry blender or 2 forks, cut butter into the dry ingredients until it resembles peas. Stir in the pecans. Sprinkle on top of filling.
Bake in the preheated 350°F oven for 45-55 minutes or until the topping is golden brown and the center of the sweet potatoes is set when gently shaken.
Serve warm.
Notes
Pumpkin Pie Spice - I use pumpkin pie spice in this recipe and the spice combination works beautifully. Pumpkin pie spice doesn't taste like pumpkin. It's a combination of cinnamon, nutmeg, ginger, allspice and cloves. You can use ground cinnamon, instead without any issues.
Use Large Sweet Potatoes - When choosing sweet potatoes err on the side of larger, rather than smaller. Clean thoroughly leaving the peel intact. It's helpful to place them onto a sheet pan and pierce the top with a knife to allow steam to escape while baking.
Should the Sweet Potatoes be Baked or Boiled? I recommend that you bake your own sweet potatoes for this sweet potato dish. It makes them super easy to peel and less nutrients are lost. Plus, it's a whole lot easier to do than peeling and boiling them, which may add unnecessary moisture to the filling. If you choose to boil them, use a large pot and make sure that you drain them well.
Can I Use Canned Sweet Potatoes? Canned sweet potatoes often include additional sugar. You could adapt this recipe using canned sweet potatoes in a pinch, but you may need to adjust some of the other ingredients as well. When in doubt, follow the recipe as is and bake your own for the best outcome.
Milk - I really love the rich flavor of evaporated milk in this recipe. You can also use whole milk or heavy cream.
Nuts - You could use walnuts in place of pecans.
Maple Syrup - You can add a splash of maple syrup to the sweet potato mixture.
Marshmallows - You can skip the crumble and top this dish with mini marshmallows.