Preheat the oven to 375°F and prepare a 12-inch cast-iron skillet or medium casserole dish by greasing it.

In a large bowl, mix pumpkin puree, sugar, eggs, pumpkin pie spice, salt, and vanilla extract until combined. Incorporate the heavy cream until the filling is smooth. Transfer this mixture to the prepared dish.

In another bowl, combine flour, sugar, cinnamon, and salt. Then, add melted butter and stir until the mixture resembles crumbles. Evenly distribute this topping over the pumpkin layer.

Bake until the filling is set and the top is golden brown, which should take about 40 to 45 minutes. Cover loosely with foil if it browns too quickly.

Let the dish cool for 10 minutes to firm up the filling. Serve warm, ideally with ice cream or whipped cream, especially cinnamon ice cream for a delightful combination!