Prep the oven: Preheat to 325°F (163°C). Set a rack in the center.
Lightly grease a 12-cup muffin tin or line with silicone liners for easy release.
Whisk the wet ingredients: In a bowl, whisk pumpkin puree, eggs, coconut milk or cream, and vanilla until smooth and well combined.
Add sweetener and spices: Whisk in erythritol or monk fruit, pumpkin pie spice, and salt. If using, whisk in almond flour. The mixture should be silky and pourable.
Taste and adjust: Sweeten to your preference.
Keep in mind that sweetness mellows slightly after baking and chilling.
Fill the cups: Divide the batter evenly among the muffin wells, filling each about 3/4 full.
Optional water bath: For the smoothest texture, place the muffin pan on a rimmed baking sheet and pour hot water onto the sheet (not into the muffin wells) to create a shallow bath. This helps prevent cracking.
Bake: Bake 18–24 minutes, until the edges are set and the centers still have a slight jiggle. Do not overbake.
Cool: Let the cups cool in the pan 15 minutes, then transfer to a rack.
They will continue to set as they cool.
Chill for best texture: Refrigerate at least 2 hours or overnight. Serve chilled or at cool room temperature with your favorite low-carb topping.