Step 1

Bring a large pot of salted water to a boil.  When boiling, add macaroni and boil until just under al dente according to package directions.

Step 2

Meanwhile, preheat oven to 375 degrees. Spray a deep casserole dish (roughly 8 ½ ” x 10 ½ ”) with cooking spray and set aside.

Step 3

In a medium sauce pot over medium-high heat, melt butter.

Step 4

Add red onion and sauté until softened, about 3 minutes.  Add garlic and sauté 1 minute more.

Step 5

Sprinkle flour over the top and stir, cooking 2-3 minutes more.

Step 6

Add the milk whisk until boiling.

Step 7

Remove from heat and add mozzarella and 1/3 of the feta.  Stir until mostly melted.

Step 8

Add oregano, marjoram, pepper, diced tomatoes, olives and spinach.  Stir to combine, add 1/4 teaspoon salt, or more as needed.

Step 9

Transfer everything to the casserole dish.  Top with the remaining feta cheese.

Step 10

Bake 20 to 22 minutes or until top golden. Garnish with dill or parsley.