Preheat oven: Preheat oven to 375°F (190°C).
Prepare the filling: In a medium bowl, whisk together the pumpkin, sugar, heavy cream, salt, cinnamon, nutmeg, and ginger until well combined. Beat in the eggs until smooth.
Pour the filling: Pour the filling into a 9x9-inch baking dish.
Prepare the topping: In a small bowl, mix together the oats, brown sugar, and pecans (if using). Add the cold butter and mix until the mixture resembles coarse crumbs.
Top the filling: Spread the topping evenly over the filling.
Bake the crisp: Bake the crisp for 35-40 minutes or until the topping is golden brown and the filling is set.
Serve: Serve the crisp warm, topped with whipped cream or vanilla ice cream if desired.