In a medium saucepan, set over medium heat, add the butter. When melted, add the shallot and garlic. Cook until the shallot has softened, about 2 to 3 minutes. Mix in the chile powder, cumin, salt, oregano, coriander, cayenne and cloves. Cook for 1 to 2 minutes, until the spices are fragrant. Add the pumpkin puree, yogurt or crème fraîche and mix until warmed, about 2 to 3 minutes. Give it a taste and adjust the salt to your liking. It might be a bit salty but it’s ok because the pasta will need it! Set aside. 

Meanwhile, bring a cast iron oven filled with salted water to a boil. Add the pasta and cook until al dente (mine took about 8 to 9 minutes). Scoop out about 3/4 cup of pasta water and set it aside. Drain the pasta and add it back to the cast iron oven. 

Add the pumpkin mixture to the pasta and pour in about 1/2 cup of pasta water. Toss until the pasta is evenly coated in the sauce. If needed, add an extra 1/4 cup of pasta water. Divide amongst plates or bowls and garnish with pepitas.