Preheat oven to 375°.
Cook the pasta in a large pot of boiling water until it's al dente, or has a firm bite, about 3 minutes less than the package calls for.
To make the ricotta, crumble the tofu into a food processer fitted with an s-blade. Add the lemon juice, garlic, and nutritional yeast and blend until the mixture is thick and looks like ricotta cheese. Add a little water if the mixture is too thick. Add the sage and pulse until it’s mixed in. Set aside.
In a large bowl, gently mix together the cooked pasta, tofu ricotta, pumpkin, garlic, sea salt and black pepper.
Spread the mixture evenly in a 9×12” casserole dish. Sprinkle with the bread crumbs and pecans.
Cover with foil and bake for 30 minutes. Remove the foil and bake for an additional 5 to 10 minutes, until the top is golden brown.