In a large bowl, combine the dry ingredients with the zucchini, cheese, scallions and peppers. Combine buttermilk and eggs in a measuring cup, and beat lightly. Pour over dry mixture, and stir to combine. Will be very thick. Pour into a greased 9x5" loaf pan, and bake for 1 hour, or until a toothpick comes out clean. Turn out on a wire rack and cool completely before slicing.
OK, so the cooling completely is the hardest part, honestly. Now for lunch I am having a thin slice of this, topped with a slice of fresh tomato, salt, pepper, and provolone cheese, run under the broiler. YUM!!!