Stir in the tomato paste and cook for 1 minute, letting it darken slightly to deepen the flavor.
Add the crushed tomatoes, vegetable bouillon, dried oregano, Italian seasoning, and crushed red pepper flakes.
Season the sauce with 1/2 teaspoon salt and 1/4 teaspoon black pepper, then stir everything until well combined.
Bring the mixture to a gentle simmer and cook for 5 minutes to let the flavors meld.
Reduce the heat to low, pour in the heavy cream, and simmer for 2 to 3 more minutes, stirring occasionally.