Shredded potato and sun dried tomato casserole

We tried this recipe: http://www.thekitchn.com/recipe-egg-hash-brown-casserole-with-cheddar-sun-dried-tomatoes-167015 We used one shallot instead of a small onion. (Apr. 2017)

Note: For the 3 Tbsp hot mustard, we followed this recipe: http://www.seriouseats.com/recipes/2012/01/hot-mustard-recipe.html We whisked together 3 Tbsp Colman’s hot mustard powder with 3 Tbsp cold water in a medium mixing bowl, to which we later added the eggs and milk.