Whisk together buttermilk, eggs, Dijon mustard, garlic powder, salt and pepper in a shallow bowl.
Coating
Mix crushed pretzels and parsley in another shallow bowl.
Chicken
Dip chicken breasts into marinade, let excess drip off, then press into pretzel crumbs.
Place on wire rack, drizzle with melted butter, and bake at 400°F for 20–25 minutes until internal temperature reaches 165°F.
Sauce
Melt butter in a saucepan over medium heat, whisk in flour and cook for 1 minute.
Slowly whisk in milk and simmer for 3–4 minutes until thickened.
Remove from heat, stir in cheddar, Dijon mustard and honey until smooth.
Notes
Testing note: Pounding the breasts prevents uneven cooking and helps the pretzel coating adhere.Testing note: Tent chicken with foil if the crust browns too fast during baking.Testing note: Freeze leftovers individually wrapped to avoid freezer burn.