Step 1

Cook the pasta according to package directions. Then drain and set aside.

Step 2

In a pan, melt the butter and cook the onion and garlic until lightly browned.

Step 3

Add the flour to the onion mix and stir, mixing thoroughly.

Step 4

Whisk in the milk, and stir until the mixture is thickened.

Step 5

Add the tomato paste, diced tomatoes and oregano. Stir until the tomatoes are warmed through.

Step 6

Gradually stir in the grated and parmesan cheeses.

Step 7

Add the pasta and stir.

Step 8

Serve right away and enjoy!