Spinach Herb Turkey Burgers with Portobello Buns

Ingredients

• 1 pound lean ground turkey
• 1 cup frozen chopped spinach, thawed and squeezed dry
• ⅓ cup Kalamata olives, chopped
• 1 ½ teaspoons lemon zest
• 1 teaspoon garlic powder
• ½ teaspoon dried oregano
• ¾ teaspoon salt, divided
• ½ teaspoon ground pepper, divided
• 2 tablespoons extra-virgin olive oil
• 8 large portobello mushrooms, stems removed (see Tip)
• 4 tablespoons tzatziki
• 1 cup arugula
• 8 (1/4 inch thick) rings red onion

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