Creamy Broccoli Cheddar Casserole with Garlic Butter Pretzels

Name: Creamy Broccoli Cheddar Casserole with Garlic Butter Pretzels
Prep time: 45 min
Cook time: 45 min
Total time: 1 h 30 min
Cuisine: American
Ingredients: 3/4 cup warm water; 2 1/4 teaspoons instant yeast; 4 tablespoons salted butter, melted; 2 1/2 cups all-purpose flour; 1/4 cup baking soda; 1 egg, beaten; 3 tablespoons melted butter; pretzel salt (for sprinkling) (any large grain salt will work); 1 yellow onion, chopped; 1/4 cup all-purpose flour; 3 cloves garlic, chopped; 1 teaspoon paprika; 1/4 teaspoon cayenne, more or less to taste; 2 tablespoons fresh thyme leaves; 3 cups low sodium veggie or chicken broth; 4 cups broccoli florets, chopped; 1 large pinch kosher salt; 1 large pinch black pepper; 2 cups whole milk; 2 1/2 cups shredded sharp cheddar cheese