Begin by bringing a large pot of salted water to a rolling boil. Add in the spaghetti and cook until al dente, about 8-10 minutes. Drain and set aside.

In a large skillet over medium heat, cook ground beef or sausage for 5-7 minutes, breaking it apart until browned. Drain excess fat.

In a mixing bowl, combine cooked spaghetti, marinara sauce, browned meat (if using), and seasonings. Stir until evenly coated.

Transfer the spaghetti mixture to a non-stick bundt pan or shape into a brain on a lined baking sheet. Create folds to mimic a brain.

Sprinkle shredded cheese on top, covering the spaghetti contours.

Preheat oven to 350°F (175°C). Bake for 25-30 minutes, until cheese is bubbly and golden brown.

Allow to cool for a few minutes, then invert onto a serving platter. Drizzle extra marinara sauce around for a spooky effect.