Cheesy Zucchini Gratin! (Low Carb)

Ingredients
Gluten free
Produce
3 large cloves Garlic
1 Onion, small thin
1 Zucchini, large
Canned Goods
1/4 cup Beef broth
Baking & Spices
1/2 tsp Pepper
1/2 tsp Salt
Dairy
4 tbsp Butter
1 cup Cheese
1/2 cup Heavy cream
1/2 cup Parmesan cheese

FULL