Preheat the oven broiler on low.
Add the tomato, pesto, garlic, and oregano to a blender. Blend until fully combined. Season with salt and pepper to taste.
Prep the ingredients per the instructions above.
Lightly toast the bread. Then set aside.
Heat the oil in a saute pan on medium heat. Saute the mushrooms until golden brown and softened. Set aside.
Spread the sauce onto the bread, covering it well. Evenly distribute the cheese, onions, and mushrooms.
Place on a foiled-lined baking sheet under the broiler until completely melted. (Keep a watchful eye while using the broiler.)
Serve the pizza breads with carrot sticks, ranch, and sparkling water.