3 sausage gruyere strata Recipes

italian sausage, casings removed, extra virgin olive oil , plus, extra virgin olive oil , for casserole, chopped onion, chopped red bell pepper, garlic, minced, chopped fresh flat-leaf parsley, kosher salt , plus, kosher salt , to taste, fresh ground black pepper, eggs, milk, day-old italian bread or 6 -8 slices french bread (1/2-inch), grated gruyere cheese

two 1/2-lb baguettes, cut into 1/2-inch dice, unsalted butter, extra-virgin olive oil, onion, finely chopped, celery ribs, peeled and cut into 1/2-inch pieces, jalapeno, seeded and minced, sweet italian sausages (about 4), casings removed, smoked baked ham , cut into 1/3-inch pieces, andouille sausage (about 4 oz), finely diced, thyme leaves, kosher salt, freshly ground pepper, gruyere cheese , cut into 1/3-inch pieces, freshly grated parmesan cheese, eggs, lightly beaten, chicken stock, half-and-half or whole milk