Gluten-Free Kale and Butternut Squash Gratin
Coconut oil is a suitable replacement for olive oil, if you prefer.
You can use 1/4 cup flaxseed meal in place of nutritional yeast.
Nutritional yeast resembles Parmesan cheese in flavor and looks light light brown flakes. It is nutrient-dense, as is flax meal; both are inexpensive and add a punch of flavor to the topping.
Watch dish closely when baking uncovered, as meal tends to burn easily.