Pre-heat the oven to 400°F.
Cook spaghetti until very al dente; 8 minutes; noodles will continue to cook in the oven; drain and rinse under cold water.
In a large bowl, toss cooled spaghetti with 2 beaten eggs, shredded mozzarella, 1/2 cup grated Parmesan and 1 cup marinara.
Spray a muffin tin with cooking spray and nest spaghetti inside.
Using the bottom of a shot glass, firmly press down to create a well.
Place in the pre-heated oven and bake until set; 5 minutes; remove from the oven and allow to cool.
If nests puffed up while baking, press down again with shot glass.