Prep the ricotta: If your ricotta looks watery, place it in a fine-mesh sieve over a bowl for 20–30 minutes. Removing excess moisture keeps the cream thick and stable.
Blend the base: In a medium bowl, whisk together ricotta and mascarpone until smooth and fluffy, about 1–2 minutes.
A hand mixer on low speed works well, but a whisk is fine.
Add pumpkin and flavorings: Whisk in pumpkin puree, powdered sweetener, vanilla, cinnamon, nutmeg, ginger (if using), and a pinch of salt. Taste and adjust sweetness and spice. The mixture should be lightly sweet with a warm spice finish.
Fold in extras: If you like texture, fold in a tablespoon or two of sugar-free chocolate chips or finely chopped nuts.
Keep some for topping.
Chill to set: Cover the bowl and refrigerate for at least 1 hour, preferably 2–3. Chilling thickens the cream and makes it easier to pipe or spoon neatly.
Assemble the cups: Spoon or pipe the cream into almond tart shells, small ramekins, or dessert glasses. Fill nearly to the top for a clean look.
Finish with toppings: Add a small dollop of whipped cream, a sprinkle of chopped pistachios or pecans, and a few chocolate shavings.
A light dusting of cinnamon makes it pop.
Serve: Enjoy chilled. The flavors deepen after a few hours, so they’re excellent made ahead.