Step 1

Preheat oven to 375 degrees F and grease an 8x8 baking dish.

Step 2

Bring a large pot of water to a boil. Once boiling, add frozen onions and simmer for 5-8 minutes or until tender. Drain.

Step 3

In another large saucepan, melt butter over medium heat. Stir in flour and cook for 1 minute.

Step 4

While continuously stirring, slowly add in the heavy cream and broth to saucepan. Simmer another 1-2 minutes over low heat and add nutmeg.

Step 5

Remove from heat and stir in ¼ cup of the parmesan cheese and season with salt and pepper.

Step 6

Add onions to sauce and stir until fully combined.

Step 7

Transfer mixture to the prepared baking dish and top with remaining cheese.

Step 8

Bake for 30-35 minutes or until top begins to brown.

Step 9

Serve warm.