Separate eggs and beat the whites until stiff. Beat yolks and fold into whites, along with flour, salt and pepper.
Meanwhile, heat oil in a large skillet. Dip stuffed chiles, one at a time, into egg batter, then remove with a large spoon. Carefully lower coated chiles into hot oil, 3 or 4 at a time. Fry until golden brown on both sides. The chiles may be made ahead to this point.
To serve immediately, arrange on platter or individual plates and pour warm Taco Sauce over each chile. Garnish with more cheese and run under broiler to melt cheese, if desired.
May be made in advance up to the point of topping with cheese, and reheated in a 400-degree oven about 10 minutes.