Boil salted water in a pot. Add the macaroni and cook according to the package instruction to al dente, then drain.
Add oil to a skillet over medium heat. Once hot, add the onions and cook for 3 minutes, until softened.
Add the garlic and sauté for just 30 seconds, until aromatic.
Add the spaghetti sauce, Italian seasoning, and salt.
Simmer for 5 minutes, stirring occasionally. Add 1 cup of the mozzarella and the drained macaroni. Stir to combine.
Add spoonfuls of the ricotta over the top, don’t stir it in. Top with the remaining mozzarella.
Heat on medium low until the cheese is melted. You can either serve it in a dip bowl, or transfer it to a food-safe Halloween skull.
Serve with bread, crostini, or breadsticks.