Step 1

Slice the zucchini into ¼ inch rounds. Place on a paper towel lined baking sheet and sprinkle with the salt. Let set for 45 minutes to remove moisture from the zucchini.

Step 2

Preheat oven to 400 degrees.

Step 3

While the zucchini is setting, make the cheese sauce by adding the cream and cream cheese to a small sauce pan over low heat. Stir until the cream cheese has melted and the mixture is hot.

Step 4

Add the garlic powder, onion powder, and ground mustard and whisk to combine.

Step 5

Remove from the heat and stir in 1 ½ cups of cheddar and ¼ cup of Gruyere. Whisk until smooth and creamy.

Step 6

Pat zucchini dry, wiping off any large amounts of salt, and place half of the zucchini in a greased 8x8 baking dish. Sprinkle with ground pepper.

Step 7

Spoon half of the cheese sauce over the zucchini and spread to coat.

Step 8

Place remaining zucchini in the dish, top with the remaining cheese sauce, and sprinkle with the remaining cheddar and Gruyere.

Step 9

Bake uncovered for 30-35 minutes. Let set for 5 minutes before serving.