Spinach Goat Cheese Stuffed Mushrooms

Ingredients:

• 12 baby portabella mushrooms
• 1 lemon
• 5 ounces chopped, frozen spinach, thawed
• 2-3 ounces goat cheese or dairy-free cream cheese
• 1 tablespoon olive oil, plus a drizzle more for garnish
• 5 ounces frozen artichoke hearts, thawed and chopped
• or
• 5 ounces canned artichoke hearts, drained and chopped
• 1 shallot, minced
• 2 cloves of garlic, minced
• 1/3 cup fresh breadcrumbs
• 1/2 cup grated Parmesan or dairy-free cheese, divided
• salt and pepper, to taste