Preheat oven to 400°F; line baking sheet with parchment paper
Shred cheese; set aside
7 ounces Comte or Gruyere cheese
In a small bowl, combine olive oil and dry seasonings; set aside
2-3 tablespoons olive oil, ¼ teaspoon thyme, ground, 1 teaspoon garlic powder, ½ teaspoon salt, ½ teaspoon black pepper
Cut cauliflower into quarters; then pull or cut florets and place in large mixing bowl
1 large cauliflower
Add chopped onion and olive oil mixture to cauliflower; toss till well-coated; place on prepared baking sheet; bake @400°F for 20 minutes
1 cup chopped yellow onion
Place cooked cauliflower and onions in food processor; add sour cream; pulse till semi-smooth
⅓ cup sour cream
Cut Challah or Brioche bread in half lengthwise; add cauliflower spread to bottom half of loaf
1 loaf Challah bread
Top with shredded cheese; place top of Challah bread on cheese; wrap in foil and bake another 10-minutes or until cheese is fully melted
7 ounces Comte or Gruyere cheese
Remove from oven, slice and serve
Video
Notes
For best results, make sure the cauliflower is in a single layer on the baking sheetIf the cauliflower head is really big, you may have to pusle the ingredients (in the food processor) in batchesIf you want a creamier version, add 6-8 ounces of room temperature cream cheese to the food processor