Being a college student, I get the time constraints. I would always cook 3 fried eggs for breakfast, and either buy a "protein salad" which had hard boiled eggs, sandwich meat and cheese on it, or bring a can of tuna with some mayo and veggies to mix in. Hard boiled eggs are a god send though. If you dont have a lot of time in the mornings, boil a dozen eggs one night and then you have breakfast for a few days if you take a couple of those and some fruit with you.
As for the muffins, you can search egg muffins online, but I have a breakfast casserole I make lots (made one this morning actually!), and you can easily put it into muffin tins instead of a 9X13 pan.
2 bunches green onions, finely chopped
3 cups finely sliced mushrooms
4 cups milk (I use 2%)
roughly 2 cups shredded cheese (I use marble)
Cook the green onions and mushrooms in a pan with butter or olive oil. Whisk all eggs together in a large bowl, then whisk in the milk and the rest of the ingredients. Once whisked together, pour into pan or muffin tins. I bake the casserole on 375 for about 40-45 minutes, but if its in muffin tins, bake them for about 20-25. If you want to check that they're done, stick a knife into the middle of one (preferably one in the middle of the tray), and if the knife comes out clean, then its done.
Note: Sometimes I'll throw in whatever leftover meat I have too. Its pretty versatile for whatever you have on hand.