Scalloped Potatoes With Ham with flour

3 cups leeks , washed very well and then thinly sliced (about 6 large, white and pale green parts only) 1/2 cup unsalted butter 3 1/2 cups whole milk 6[...]

2 tablespoons olive oil 1 lb bulk Italian sausage 2 onions , thinly sliced 1 large red bell pepper , seeded and cut into 1/3 inch strips 1 large green bell[...]