Does anyone knows what kind of breakfast people ate back in 1850?

Come on guys people in 1850 were not that much different from us, we're not talking about 1850BC!

They would have....fresh eggs and bacon, ham and water/ or coffee, bread, oatmeal, porridge and pancakes (back then called 'flap jacks'). The other answer is correct in that there were no breakfast cereals till the 1880's/ 1890's. 'Orange juice' would just be for rich/ elite people then, although in the Fall commoners would have 'cider' (apple juice).

Generally some kind of porage or gruel (thin porage), either oats in Britain or often wheat based in the US - grits or hominy. This was often laced with whatever came to hand, sugar, honey, syrup or even beer and whisky. Usually bread, corn bread scones or oatcakes according to the region would be eaten too. This might be accompanied by small (low alcohol) beer or weak tea or coffee. For many people however breakfast was whatever was left-over from the night before just as it is for some today.

For the wealthy breakfast offered a much greater choice. In Britain it might include kippers (smoke cured herring), kedgeree (a curry of chopped boiled egg and smoked haddock), ham or bacon, eggs (scrambled, poached or fried), devilled kidneys, mushrooms and grilled tomato with fried bread, and toast or scones. All this was washed down with tea or coffee.

That was before "breakfast food" garbage. Kellogg came later selling his junk food as "health" food. That's one big reason we have so many fat people now.

People had eggs probably - if they could get them - and ham. Mostly people lived on peas and beans. "Peas Porridge Hot, Peas Porridge Cold..." You'd have a pot of beans or peas or lentils or whatever on the stove (no refrigeration) - and you'd take out a square and eat it cold or build a fire and cook it up - scrape off the mold.

Food was scarce all through human history - that changed after WW 2 with the Agra-Business. Now food is really cheap in relation to years back.

A lot would depend on where one lived geographically, but in the USA, people would likely have

fresh eggs, homemade bisquits with sorgum/molasses and homemade preserves and hot coffee.

People made their own butter. There was milk and homemade buttermilk. Grits were popular in the South. Buckwheat cereal/porridge and meals like oatmeal was served. Sausages were popular and ham... Orange juice and certain fruits were often not available due to transportation/freshness issues.

My grandmother spoke of receiving oranges as a delicacy gift during Xmas...

In some ways it was better ie. lots more folkes lived on farms and spent much more time preparing dishes and storing foods... Breakfast cereals like corn flakes...and Kellogues were actually promoted to battle onanaism<masterbation>due to the theory that onanism depleted one's physical and psychological well-being and that breakfast was thus very important so as to quickly replenish one's body. Supposedly the dry cereals with milk added contained the precious elements one needed to replenish one's body. The cereals tasted fine, but it was also a bit of quackery. Pncakes and omelettes were eaten in the 19th century. Bagels...

Whatever one had on hand ie. corn bread might be served, more diversity of meat products ie. whatever available via one's own farm. People cooked more with lard... Sweet Potatos/Yams were quite popular in the South.Hominy and Hominy Grits were part of the diet and go back well into Native American times ie. Cherokee dishes...

They just grabbed a triple soy latte at Starbucks, and then hit the drive thru at Mickey D's for a sausage McMuffin with egg1

Depends on where they're from. I'm guessing they probably drank tea and ate biscuits. Something simple. Most countries didn't have indoor plumbing or refrigerators. My Dad is about 61 years old and he is from Pakistan. I ask him about his child hood all the time and that's what he said it was like.

probably beans and coffee