Chicken Tzatziki Pizza

For Tzatziki Sauce

• 1 cup plain greek yogurt
• ½ cup sour cream
• 2 cloves garlic
• 1 cucumber peeled, cut in quarters and seeded
• 1 tablespoon lemon juice
• 1 tablespoon olive oil
• 2 tablespoons fresh dill
• kosher salt

For Pizza

• 4 pieces Greek flatbread or pita breads
• Tzatziki sauce
• 2 cups shredded Mozzarella cheese
• 1 cup shredded chicken breast
• ½ cup sliced kalamata olives
• ⅓ cup sliced sun-dried tomatoes
• 1 cup quartered artichoke hearts packed in water drained
• ⅓ cup feta cheese
• oregano
• kosher salt
• Fresh dill for garnish
• red chili pepper flakes for garnish