Ingredients

• 1/4 cup butter
• 5 skinless, boneless chicken breasts, thinly sliced
• 1/2 cup mayonnaise
• 1/2 cup milk
• 1/2 cup hot pepper sauce (such as Frank's® RedHot)
• 2 tablespoons prepared yellow mustard
• 1 (1 ounce) package ranch dressing mix
• 1 (16 ounce) container sour cream
• 1/2 cup grated Parmesan cheese
• 2 tablespoons heavy whipping cream, or as needed

Instructions

1. Melt butter in a large saucepan over medium heat. Add chicken breasts; cook until no longer pink, 2 to 3 minutes per side. Stir in mayonnaise, milk, hot pepper sauce, mustard, and ranch dressing mix. Bring to a simmer; cook, stirring occasionally, until flavors combine, 10 to 15 minutes.
2. Stir sour cream and Parmesan cheese into the saucepan; bring to a simmer. Stir in heavy cream until sauce thickens to the consistency of gravy. Remove from heat; let stand before serving, about 5 minutes.