01 -
Preheat oven to 450°F. Coat a wire rack with cooking spray and place on a foil-lined baking sheet.
02 -
Bring 2 cups water and barley to a boil in a small saucepan. Reduce heat, cover and simmer until tender, 10 to 12 minutes. Set aside.
03 -
Pulse 3/4 cup pistachios, breadcrumbs, orange zest and garlic powder in a food processor until pistachios are coarsely chopped. Transfer to a shallow dish.
04 -
Whisk egg white with remaining 1 tablespoon water in a separate shallow dish.
05 -
Place chicken between two sheets of plastic wrap. Pound to 1/2-inch thickness using a mallet or heavy pan. Sprinkle with 1/4 teaspoon salt.
06 -
Dip chicken into egg mixture, then dredge in pistachio mixture, pressing to adhere. Place on prepared rack and spray both sides with cooking spray.
07 -
Bake until an instant-read thermometer in the thickest part reads 165°F, about 15 minutes.
08 -
Heat oil in a large skillet over medium heat. Add tomatoes and vinegar and cook for 1 minute until tomatoes begin to soften. Remove from heat.
09 -
Drain barley if needed. Stir into tomatoes along with remaining 1/4 cup pistachios, 1/4 teaspoon salt and chopped parsley. Serve with chicken.