Crockpot Egg Casserole

slices center-cut bacon (cut into bite-size pieces)

red bell pepper (seeded and 1/4-inch-diced (about 1 cup))

medium shallot (finely chopped (about 1/4 cup) or 1/4 cup finely chopped yellow onion)

large eggs

nonfat milk

Dijon mustard

kosher salt

ground black pepper

ground cayenne pepper

lightly packed cups 3/4-inch-cubed day-old baguette (about 6 1/2 ounces)

frozen chopped spinach (thawed and squeezed as dry as possible)

artichoke hearts (drained, roughly chopped, and patted dry)

shredded fontina cheese (or similar melty cheese, such as provolone or mozzarella)

block-style feta (crumbled)