Savory Mushroom and Red Pesto Galette

Ingredients

• 1 pack baby bella (cremini) mushrooms, sliced
• 1 sweet white onion, thinly sliced
• 4 cloves garlic, minced or 4 cubes Gefen Frozen Garlic
• 1 tablespoon unsalted butter
• salt, to taste
• black pepper, to taste
• 1 teaspoon dried or fresh thyme
• 1 tablespoon fresh parsley, minced
• 1 tablespoon Marsala cooking wine
• 1/2 cup fresh spinach (or 1 cup Beleaves Frozen Spinach, thawed and drained)
• 1 sheet puff pastry or homemade galette dough
• 2 to 3 tablespoons Tuscanini Sun-Dried Tomato Pesto, plus more for dipping
• fresh mozzarella, shaved or grated
• 1 egg, beaten (for egg wash)