When getting bread, try to pick out a dense bread loaf. Some stores offer things like "bake at home" bead, which is bread that is already cooked, you just pop it in the oven for a few minutes. This type of bread tends to be denser than freshly baked at the bakery. If you can't find bread like that, then chop an Italian loaf into 1/2 inch cubes, spread it out on a large baking sheet, and let them dry for about 24 hours.
Preheat oven to 375 and grease a 13x9 casserole dish.
Spread cut bread in a casserole dish.
Cut off the dark green parts of the leek and discard. Wash and cut the leek in half, lengthwise. Slice each half into thin semi-circles. Add sliced leek to the casserole dish.
Dice ham and cheese and add it to the casserole dish as well.
Gently mix bread, ham, leek, and cheese to incorporate throughout.
In a large mixing bowl, whisk eggs, milk, minced dill, paprika, salt, and pepper in a bowl.
Carefully pour the egg mixture all over the bread mixture. Press gently.