Spinach and Vegan Cheese Tarts

Ingredients

• 1 2-count box frozen puff pastry sheets, thawed in the refrigerator overnight
• 3 tablespoons Country Crock Plant Butter Tub with Olive Oil
• 1 medium yellow onion, chopped
• 2 cloves garlic, finely chopped
• 1 pound chopped spinach
• 1/2 teaspoon kosher salt
• 1/4 teaspoon crushed red pepper flakes
• zest from 1 lemon, divided
• 1 cup vegan mozzarella shredded cheese
• 1/2 cup crumbled vegan feta-style cheese