Rosemary Walnut Crispies: Preheat oven to 375°F. Run the walnuts through a food processor until they have a chopped texture. Arrange chopped walnuts on a small sheet pan and toast in the oven for 8-10 minutes. Remove from the oven and toss with rosemary, butter, sugar, and pepper. Set aside to cool.
Pasta: Cook according to package directions. Drain.
Pumpkin Alfredo Sauce: While the pasta cooks, heat the butter in a skillet over low heat. Add the garlic and saute until fragrant (do not brown the garlic – it tastes bitter). Add the pumpkin and broth; simmer until smooth. Add the cream; simmer until the sauce coats the back of a spoon. Add a little squeeze of lemon juice if you’re into that. Add cooked pasta to the sauce.
Assemble: Serve pasta in shallow bowls with a sprinkle of the walnut crispies on top, and a little sprig of rosemary for a fancy garnish if, you know, you’re fancy.