1/3 cup all-purpose flour
2 teaspoons salt, divided
1/2 teaspoon black pepper
2 pounds beef top or bottom round, cut into 1/2-inch chunks
4 tablespoons vegetable oil
2 medium-sized onions, cut into 1-inch wedges
1/2 pound fresh mushrooms, sliced
1 (10-ounce) package frozen mixed vegetables
1 cup beef broth
1/2 teaspoon garlic powder
1/4 teaspoon ground red pepper
1 teaspoon browning and seasoning sauce
1 (12-ounce) package refrigerated buttermilk biscuits (10-12 biscuits)