A breakfast sandwich usually consists of at a minimum:

• bagel or english muffin
• egg
• optional - extra - some kind of meat like bacon or sausage

On my already admittedly loud and dressed up sandwich (just made a batch earlier today), I like:

• EVERYTHING BAGEL (all the seeds and stuff)
• CREAM-CHEESE on the bagel both sides
• BUTTER on the bagel both sides
• GUACAMOLE on the bagel both sides, maybe some in the middle
• EGG (brown) -> omelette evenly split up into 7 portions for 7 days of the week or worth of breakfasts
• SALSA covering up all the yellow of the egg
• HASHBROWN/potato patty
• maybe some BRUSCHETTA to get that tomato complimenting potato even tho thats covered by the salsa already