Preheat oven to 350°F.
In a pot of salted boiling water, cook the lasagna according to the directions on the package. Once cooked, drain well and lay flat on a dish or cutting board.
Heat a sauté pan on medium heat. Once hot, add the oil. Saute the onion and garlic until golden brown. Then remove from the heat.
For the sauce, heat the oil in a saucepan over-medium heat. Saute the garlic and scallions. Gradually whisk in cream. Bring to a simmer then remove from the heat.
In a bowl mix the sausage, onion garlic mixture, ricotta, and oregano. Lay the noodles side by side and place the mixture across them evenly.
Then roll each one up tight.
Grease a casserole dish or small oven safe vessel with non-stick spray (I use a small oven safe baking dish for the portions I'm making. You don't want extra space or the filling will ooze out).
Place a ladle of sauce on the bottom of the baking dish. Place the lasagna rolls seam side down into the baking dish and pour the remaining sauce over top. Cover tight with foil. Bake for 20 to 30 minutes, to an internal temperature of 150 degrees using a thermometer.
Let sit for 2-3 minutes before serving. Serve with bread and garnish with scallions.