Cooking breakfast for a group has one specific failure mode. You stand at the stove making eggs in batches, the first people eat, the last people wait, and by the time you sit down everyone else is finished and your own food is cold.
I did that for eleven people once.
The fix is not working faster. It is choosing dishes that finish at the same moment for everybody, which almost always means the oven rather than the hob, and doing the assembly the night before. Here are the ones that work, with the quantities written down.
What actually makes a group breakfast work
One thing that comes out of the oven at a set time, plus two or three things sitting out that need no cooking at all. That is the shape of every successful group breakfast I have hosted. The oven dish is your anchor, the rest is fruit, pastries, yogurt, and coffee that people help themselves to.
Quantities are the other half, and most people wildly underestimate. Plan on two eggs per adult if eggs are the main event, three to four slices of bacon or two sausages per person, and around a cup of cooked grain or oats each. For a full spread where people take a bit of everything, budget roughly one and a half servings per person of the main dish, because it always goes faster than you expect. I noticed the first time I made a proper egg bake for twelve that I had budgeted for exactly twelve portions and ran out with two people unserved, and it has been one and a half ever since.
1. Overnight egg and bread bake

Cubed bread, sausage or bacon, cheese, and an egg and milk mixture assembled the night before and refrigerated. Bake at 350 degrees Fahrenheit for 45 to 55 minutes until the centre is set. A 9 by 13 dish uses about 12 eggs and feeds ten to twelve, and letting it sit overnight is what makes the bread absorb properly.
2. Sheet pan eggs
Twelve to eighteen eggs whisked with a splash of milk, poured onto a rimmed sheet pan lined with parchment, and baked at 350 for about 15 minutes. Cut into squares. This is the single best way to serve eggs to a large group hot at the same time, and it slots into breakfast sandwiches perfectly.
3. Sheet pan bacon

Lay bacon flat on a rimmed tray and bake at 400 degrees for 15 to 20 minutes. It is flatter, more evenly cooked, and does not require standing over a spitting pan for half an hour. Two trays on separate racks handles a crowd, and swap the trays halfway through.
4. Overnight French toast bake

Thick bread soaked in an egg custard overnight, topped with a brown sugar and butter crumble before baking. Same 350 degree oven, about 45 minutes. Use stale or day old bread, because fresh bread turns to mush and this is the mistake that ruins it most often.
5. Breakfast burrito bar
Sheet pan eggs, a pan of beans, cheese, salsa, and warm tortillas set out for people to build their own. It handles vegetarians, picky eaters, and different appetites without you making anything separately. Warm the tortillas wrapped in foil in the oven for ten minutes.
6. Big batch pancakes kept warm properly
Cook pancakes ahead and hold them in a single layer on a wire rack in a 200 degree oven, not stacked on a plate under foil, which steams them soft. They will hold for about half an hour this way. Make a double batch of dry mix the night before to save yourself the measuring.
7. Yogurt and granola bar
Big bowls of plain yogurt with granola, berries, honey, nuts, and seeds alongside. Zero cooking, it looks generous, and it covers the people who do not want a hot cooked breakfast. Plan about three quarters of a cup of yogurt per person if it is a side rather than the main.
8. Overnight oats in individual jars
Made two days ahead and stacked in the fridge, which means breakfast is literally handing people a jar. Good for a group staying over multiple nights, since they keep three days. Half a cup of oats and a scant cup of liquid per jar is the ratio I use.
9. Baked oatmeal in a big dish
A warm alternative to overnight oats that serves from one pan. Assemble the night before, bake at 350 for 35 to 40 minutes, and serve with cream or yogurt. It reheats well, which is useful when people wake up across a two hour spread.
10. Breakfast potatoes on a sheet pan
Par boil cubed potatoes at home or the night before, then roast at 425 for 25 to 30 minutes with onion and pepper. Par boiling is what gets you crisp outsides and cooked insides, and skipping it is why oven potatoes often come out hard in the middle.
11. A fruit platter, prepped the night before

Cut everything except banana and apple the night before and keep it covered in the fridge. It takes fifteen minutes of work and it is the thing that makes a table look like a proper spread rather than a tray of beige food. Add the browning fruit in the morning.
12. A drinks station away from the food
Coffee, a hot water urn, juice, milk, and mugs set up on a separate surface, ideally in a different part of the room from the food. This is not a recipe and it will save your kitchen, since the coffee queue is what blocks the food table and causes the entire bottleneck.
How to plan the timing and the quantities

Work backwards from when you want people eating. Anything assembled the night before should come out of the fridge about 30 minutes ahead so it is not fridge cold going into the oven, which throws off the baking time. Then put the main bake in, and while it cooks do the bacon on a second rack, warm the tortillas or bread, and set out everything cold. Most oven dishes here need 45 to 55 minutes, so starting an hour and fifteen before serving is about right, and a bake needs 10 minutes of resting before you cut it or it falls apart on the spatula. On quantities for twelve people, one 9 by 13 egg bake plus a fruit platter and yogurt will do it. For twenty, two bakes and two trays of bacon, and check your oven actually fits both at once because that is the constraint people discover on the morning. On serving, put the food on a separate surface from the seating so people can circle it, and keep the drinks somewhere else entirely. And the honest advice about hot holding, if breakfast has to sit out, keep hot dishes covered and above 140 degrees Fahrenheit or plan to serve and then refrigerate leftovers within two hours, since a warm buffet sitting on a table all morning is the one genuine food safety risk in an otherwise easy meal.
Frequently asked questions
How much food do I need for breakfast for 12 people? One 9 by 13 egg bake using about 12 eggs, two trays of bacon, a fruit platter, and a yogurt or pastry option will comfortably feed twelve. Budget around one and a half servings per person of the main dish, since people take more than expected.
What breakfast can I make ahead for a large group? Overnight egg bakes, French toast bakes, baked oatmeal, and overnight oats can all be assembled a day ahead. Sheet pan eggs and bacon are best cooked fresh but need almost no attention while they bake.
How do I keep breakfast warm for a crowd? Hold cooked items on a wire rack in a 200 degree Fahrenheit oven rather than stacked under foil, which steams them. If food is sitting out for serving, keep hot dishes covered and above 140 degrees and refrigerate leftovers within two hours.
How many eggs per person for a group breakfast? Two eggs per adult if eggs are the main dish, or closer to one and a half if there are several other substantial options on the table. For a 9 by 13 egg bake, 12 eggs serves ten to twelve as part of a spread.
What is the easiest breakfast to serve a big group? An overnight egg and bread bake with a fruit platter and yogurt alongside. The bake is assembled the day before, cooks unattended, and serves everyone at the same moment with no cooking to order.
Final thoughts
The best group breakfasts I have hosted were the ones where I was actually sitting at the table. That only happens when the food finishes on its own schedule rather than needing you at the stove, and it is genuinely the whole trick.
So pick one oven dish, assemble it tonight, and put everything else out cold. Come back and tell me how many you fed, because the overnight egg bake is the one I would start with and it has never once let me down.