If you're starting from scratch:
1.
Chocolate-Cinnamon "Babkallah"
3.
Apple and Honey Challah
5.
Brown Sugar Challah With Pomegranate Glaze
6.
Challah Dough Cinnamon Buns
7.
Scallion Pancake Challah
If you want to turn leftover challah into something ~better~:
8.
Morning Bread Pudding With Salted Caramel
9.
Whipped Cream-Stuffed French Toast With Raspberries
11.
Overnight Cinnamon Raisin Pumpkin French Toast Bake
12.
White Cheddar Grilled Cheese
14.
Bacon Nutella-Stuffed French Toast
15.
Spinach and Fontina Strata
16.
Challah Bread Pudding With Kahlua Cream Sauce
17.
Cinnamon Sugar French Toast Sticks
18.
Make-Ahead Ham and Cheese Breakfast Casserole
19.
Chocolate Challah Bread Pudding