In a medium bowl, combine cubed chicken with barbeque sauce until thoroughly coated. Stir in cheese and red onion. Pour mixture into a greased 10-inch pie plate. Whisk eggs with milk, Tabasco sauce, pancake mix, salt and pepper, until well blended. Pour egg mixture over chicken; bake at 400 degrees for 40 to 50 minutes, or until knife inserted comes out clean. Sprinkle with chopped cilantro and slice into wedges.