Sauté the Onions: Heat olive oil in a large pot over medium heat. Add the onion and salt, cooking until softened (about 5-6 minutes).
Add Garlic + Tomato Paste: Stir in the garlic and cook for an additional minute. Add tomato paste and bouillon concentrate and cook down until it is a shade darker, about 2 minutes more.
Add Broth: Pour in a little of the broth. Stir it in to loosen up the tomato paste and prevent lumps, then add remaining broth. Add black pepper and red pepper flakes and bring to a simmer.
Cook Tortellini: Add the tortellini, cover and cook for about 7-9 minutes on medium-high heat, or until tender.
Finish the Soup: Stir in the heavy cream and spinach. Cook for another 2-3 minutes until the spinach wilts. Turn off the heat and stir in parmesan cheese to melt. Top individual bowls with more red pepper flakes and parmesan, if desired.
Video
Notes
If using Better than Bouillon (concentrated broth paste), add it when you add the tomato paste to loosen it up and toast it a bit, and then add the 4 cups water in the following step.Use evaporated milk instead of heavy cream (aka 35% m.f. or whipping cream) for a lighter version.You can substitute cheese tortellini with several other varieties for this soup. Here are some options:
Chicken Tortellini - that's my go-to choice after cheese.
Meat-filled tortellini (such as beef or pork) if you want to add a heartier element.
Spinach and ricotta tortellini for a balanced, vegetarian option.
Mushroom tortellini to add a savory, earthy flavor.
The soup will continue to thicken the longer it stands. If not serving it right away, include another cup of broth in the ingredients.