Step 1

Preheat oven to 375 degrees (F).

Step 2

Grease a 9×9 or equivalent oven proof pan.

Step 3

Overlap 1/3 of the zucchini and onion slices in the pan, then season with salt and pepper and sprinkle with 1/2 cup of shredded cheese.

Step 4

Repeat two more times until you have three layers and have used up all of the zucchini, onions, and shredded cheese.

Step 5

Combine the garlic powder, butter, heavy cream, and xanthan gum in a microwave safe dish.

Step 6

Heat for one minute or until the butter has melted. Whisk until smooth.

Step 7

Gently pour the butter and cream mixture over the zucchini layers.

Step 8

Bake at 375 degrees (F) for about 45 minutes, or until the liquid has thickened and the top is golden brown.

Step 9

Serve warm.