Cooking is where the magic truly happens. Follow these steps to bring your dish to life:

1. Preheat your oven to 375°F (190°C).
2. Place the crushed pretzels, flour, and a pinch of salt and pepper in separate shallow dishes.
3. Beat the eggs in another dish, adding the Dijon mustard to the mix.
4. Coat each chicken breast in flour, then dip into the egg mixture, and finally press into the crushed pretzels, ensuring an even coating.
5. Heat the olive oil and butter in a skillet over medium heat. Brown the chicken on each side for about 3 minutes until golden.
6. Transfer the chicken to a baking dish and bake for 20-25 minutes or until cooked through.
7. For the sauce, combine cheddar cheese, sour cream, and milk in a saucepan over low heat. Stir until the cheese is melted and the sauce is smooth.
8. Pour the mustard-cheddar sauce over the baked chicken and serve immediately.