3 cheesy spinach and strata Recipes

butter-flavored cooking spray, eggs, heavy cream, dijon mustard , like maille, fresh baby spinach leaves, chopped, tomato, diced, jarlsberg cheese, shredded, fresh basil leaf, for garnish (optional)

frozen spinach (well drained , squeeze out any excess moisture with hands), butter, fresh button mushroom, sliced (can use more or less ), onion, finely chopped, fresh minced garlic (or to taste), seasoning salt (or use white salt), cayenne pepper (or to taste or use black pepper), nutmeg, french bread (cut into 1-inch cubes ), asiago cheese (or to taste) or 3 cups gruyere cheese, shredded (or to taste), grated parmesan cheese, half-and-half cream, full-fat milk (or use 2-3/4 cups all half and half cream), eggs, dijon mustard