One Pot Lasagna

This lasagna can be whipped up in less than an hour using a single skillet.
Ingredients:
2 Tbsp olive oil
1 lbs sweet or hot Italian sausages, casing removed
1 small yellow onion, chopped
4 cloves garlic, minced
Large pinch of hot red pepper flakes
1 tsp dried oregano
2 cans 28 oz whole or crushed tomatoes, peeled
1 sprig basil or dried basil
Salt and pepper
9 oz package no-boil lasagna noodles
2/3 mascarpone cheese, cream cheese of ricotta cheese
1/2 lb fresh mozzarella, thinly sliced or shredded mozzarella