This spiralized fennel and broccoli rabe ooey, gooey, cheesy gratin is filled with nutrients from some delicious veggies. And to top it all off, it has a crispy golden crust sure to please any crowd!
Prepare the broccoli rabe by shaving the stems with a vegetable peeler, pulling off the large leaves, and snapping off each floret.
Add the fennel, broccoli rabe, garlic, shallots, salt, pepper, olive oil, and thyme to a large bowl. Toss to coat. Add 1 cup of the Gruyère cheese. Mix well.
Add the mixture to your baking dish. Press down on the mixture to create more room. This mixture will cook down by about half in the oven.
Top with the rest of the Gruyère and the 1 cup of parmesan.
Bake 30 minutes until the cheese just barely starts to brown.