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Place 3 tablespoons dressing in shallow dish or pie plate; reserve remaining dressing for sandwiches. Coat chicken lightly with dressing; dip in flour to coat.
Melt butter in a large nonstick skillet over medium heat. Add flour dusted chicken to skillet. Cook, turning to brown evenly, 10 minutes or until done (internal temp 170°F). Remove skillet from heat. Remove chicken from skillet. Drain butter from skillet except for 1 tablespoon; add hot pepper sauce and stir to mix with butter. Return to heat. Add chicken; turn to coat. Cook chicken 1 to 2 minutes per side to set pepper sauce mixture.
Serve chicken on toasted buns with lettuce. Top with remaining blue cheese dressing.