Portobello Pesto Pizza

INGREDIENTS

• :
• ½ cup warm water (about 110 degrees)
• 1 envelope (2¼ teaspoons) instant yeast
• 1¼ cups water, at room temperature
• 2 tablespoons olive oil
• 4 cups bread flour
• 1½ teaspoons salt
• 1 tablespoon unsalted butter
• 1 lb. cremini mushrooms, sliced
• ¼ of a red onion, thinly sliced
• 1 cup pesto (homemade or store-bought)
• 8 ounces provolone cheese, shredded
• ½ cup grated Parmesan cheese