1 teaspoon cornstarch, mixed with 1 tablespoon cold water
1/4 cup grated parmesan cheese
4 ounce penne pasta, cooked according to package directions
kosher salt and ground black pepper, to taste
Directions
Step 1: Using a medium saute pan over medium heat, heat 1 tablespoon unsalted butter. Saute 1 tablespoon chopped onion until translucent, about 4 minutes.
Step 3: Add 1 teaspoon chopped parsley, 1 cup heavy cream and 2 tablespoons tomato sauce. Bring to a boil.
Step 4: Add cornstarch slurry (1 teaspoon cornstarch mixed with 1 tablespoon cold water) and whisk for 1 minute. Reduce heat to medium. Whisk in 1/4 cup grated Parmesan cheese until melted.
Step 5: Add 4 ounces cooked penne, tossing to combine. Cook until pasta is heated through, about 1 minute.
Step 6: To serve, place pasta in a bowl and garnish with parsley.