Step 1: Preheat the oven.
Preheat the oven to 400 F.
Step 2: Line a sheet pan.
Line a sheet pan with parchment.
Step 3: Cut the tomatoes.
Cut each tomato in half.
Step 4: Cut the onion.
Cut the onion into bits.
Step 5: Chop the garlic.
Chop the garlic.
Step 6: Place on a sheet pan and season.
Spray the sheet pan with cooking spray before adding the tomatoes, onion, and garlic. Season with salt and pepper to taste.
Step 7: Roast the vegetables.
Roast the vegetables in the oven for 45 minutes.
Step 8: Add roasted vegetables to the blender.
Transfer the roasted vegetables to a blender.
Step 9: Blend.
Blend until smooth.
Step 10: Transfer into a pot.
Place the soup in a pot over medium-low heat to reheat for 10 minutes.
Step 11: Serve The Soup
Garnish with fresh herbs, if desired, and serve