My breakfasts usually consist of some combination of eggs, potato, sausage or bacon, and a salad. When I have more time, I make everything. When I have less time, I usually just settle for the eggs, sausage and potato. (Or eggs and sausage and then grab a banana on the way out.)
I make eggs scrambled. Eggs are awesome because they are super quick to make if you're in a hurry, and you can just throw about any veggie in there you may have had from the night before or something. I also love a hard cheese in the eggs, if you're OK with dairy.
I make sausage patties from bulk pork breakfast sausage on the weekend (I order this from a local farm but you can probably find it in stores or from a local butcher). I freeze all the sausage patties and then just reheat one or two on the stove or in the microwave for a minute in the morning. You can make enough sausage and freeze it cooked to have some every morning for a few weeks or more, depending on how much you eat/cook at once.
If you don't make the sausage I find the "Jones Dairy Farm" Pork Breakfast Sausages are actually pretty good, and really affordable, though of course not grass fed, but there's just "pork, water, salt, spices" as ingredients, and gluten free. Then there's always bacon :)
Finally, I also love potatoes (sweet and white) and usually bake a dozen or so from the week and keep them in the fridge. In the morning, I just microwave it for a minute and slather butter on it. If I have a little more time to eat, I also eat a salad (escarole, romaine, etc.) that I cut up the night before, stored in plastic bags in the fridge. Just throw some olive oil and whatever else you want on it (I use apple cider or balsamic vinegar).