3/4 cup coarsely chopped onion
1 teaspoon coarsely chopped peeled fresh ginger
2 garlic cloves, peeled
1/2 cup fage yogurt
1 tablespoon fresh lemon juice
1 teaspoon paprika
1 teaspoon ground cumin
1 teaspoon ground coriander seeds
1/2 teaspoon salt
1/2 teaspoon chili powder
1/4 teaspoon black pepper
Dash of ground nutmeg
4 (4-ounce) skinless, boneless chicken breast halves
Place first 3 ingredients in a food processor; process until finely chopped. Add yogurt and the next 8 ingredients (yogurt through nutmeg); pulse 4 times or until blended.
Make 3 diagonal cuts 1/4 inch deep across top of each chicken breast half. Combine chicken and yogurt mixture in a large zip-top plastic bag. Seal and marinate in refrigerator 8 hours or overnight, turning occasionally.
Prepare grill or broiler.
Remove chicken breast from bag; discard marinade. Place chicken on grill rack or broiler pan coated with cooking spray; cook 6 minutes on each side or until chicken is done.