Boil a pot of heavily salted water for the tortellini and cook according to package instructions. Drain and set aside.
Heat a large saucepan over medium heat and Melt butter and sauté shallots and chopped garlic for 3-4 minutes until translucent. Add Tomato paste and red pepper flakes and stir for 1 more minute.
To a blender, or food processor, add the roasted red peppers, and the onion mixture from the saute pan. Blend until smooth.
Add the mushrooms to the saute pan and cook for 3-4 minutes until they sweat. Add the sausage and cook for 5-6 minutes,, while breaking apart, until it's browned.
Return roasted red pepper mixture to the pan with the sausage. Stir in the heavy cream.. Heat on medium low heat until heated through and almost simmering.
Add spinach and stir until wilted. Stir in the parmesan until melted. Stir in the tortellini and chopped basil.