This recipe was a hit with my family when we needed to make a vegetarian breakfast for guests. The link below is to the website that has the recipe. My advice on this recipe is to bake the potatoes on the long side to be sure they are browned. I think when they are a little crunchy the texture of the casserole is better. Also, you could play around with different veggies, depending on what you like and what you have in your fridge.
https://www.loveandlemons.com/breakfast-casserole/#wprm-recipe-container-75962