Preheat oven to 400˚F.
Slice off the top of the head of garlic, exposing the cloves. Roast the whole head and save half the cloves for another recipe.
Place bell pepper (skin side up), carrots, cauliflower, tomatoes, garlic, and onion on a large sheet pan.
Drizzle with olive oil and sprinkle evenly with salt, smoked paprika, cayenne, and cumin.
Roast for 40-45 minutes until all vegetables are fork tender.
About 10 minutes before vegetables are done, heat broth over medium heat or in microwave until hot.
Once vegetables are done, add them immediately to a blender.
Squeeze out garlic cloves from half of the head of garlic and add to blender.
Add hot broth and lemon juice.
Blend until smooth. Taste and add remaining ½ teaspoon salt if needed.
Serve hot with grilled cheese or grilled cheese croutons.
To make grilled cheese croutons: Melt butter in a pan over medium low heat.
Toast bread slices until golden brown and caramelized.
Flip one slice over, add cheese slices on caramelized surface, then top with other slice cooked side down.
Cover with lid and cook until bottom is brown and crispy, flip again and cook until other side is brown and cheese is melted.
Remove from heat and slice into small cubes.