Mediterranean Pita Melts

Name: Mediterranean Pita Melts
Ingredients: 1 (6 ounce) container plain low-fat yogurt; ⅓ cup chopped, seeded cucumber; 2 teaspoons snipped fresh mint or 1/2 teaspoon dried mint, crushed; 1 clove garlic, minced; Dash salt; Nonstick cooking spray; 1/2 recipe cooked Mediterranean Meatballs (24) (see associated recipe); 3 large whole-wheat pita bread rounds, split in half horizontally; 3 large plum tomatoes, thinly sliced crosswise; ½ cup crumbled reduced-fat feta cheese (2 ounces); ¼ (12 ounce) jar roasted red peppers