Preheat oven to 400°F.
Crush pretzels in food processor until fine.
Season chicken with salt and pepper.
Set up three stations: flour, eggs, pretzels.
Dredge chicken in flour first.
Dip in beaten eggs completely.
Coat thoroughly with crushed pretzels.
Place on wire rack over baking sheet.
Bake for 25-30 minutes until golden.
Check internal temperature reaches 165°F.
Meanwhile, melt butter in small saucepan.
Add cream and mustard, whisk smooth.
Add cheese gradually until melted.
Serve chicken with warm sauce immediately.