Who hasn't started their day with a bowl of Corn Flakes at least once? While Corn Flakes weren't exactly the first packaged cold cereal product sold in America, they are undoubtedly the most iconic. As early as 1902, William Keith Kellogg began mass production of his first cereal after proving its efficacy and popularity with patients at the Battle Creek Sanitarium, where he worked alongside his prestigious doctor brother.

The Kellogg brothers were focused on offering a healthier alternative to the traditional pork-and-beef heavy English-style breakfasts that most Americans were eating at the end of the 19th century. Therefore, they developed a process that allowed them to transform thin slices of cereal into small toasted flakes of wheat or corn. Since then, Corn Flakes, combined with fresh milk, have been one of the most popular breakfasts among Americans, young and old.

Image: Sten Ritterfeld

Did you know that a one-ounce serving of Cheerios contains nearly 250 individual "O's."? Crazy, right? Introduced in 1941 by the American company General Mills, Cheerios is one of the first oat-based ready-to-eat cereals and remains one of the most widely consumed in the United States.

Back in the 1930s, General Mills engineers tested more than 500 formulas and experimented with 10 different shapes and sizes before perfecting the now-iconic "O." They finally came up with the delicious cereal that offers the nutrients of 4 cereals: oats, corn, wheat, and rice. Today, there are about 20 different flavors of Cheerios available in the U.S., including Honey Nut, Chocolate, and Apple Cinnamon. Which one is your favorite?

Image: Deena Englard

Kellogg’s is one of the most influential breakfast cereal companies in the United States and the world, and we have them to thank not only for Corn Flakes but also for our beloved Rice Krispies. This breakfast cereal made from crispy rice first appeared on the shelves in 1928. It was revolutionary at the time because the company used a new patented process called "oven-popping" to manufacture them.

Rice Krispies’ success may have been due to its claim that the cereal would remain floating even after 2 hours in milk. The brand's classic slogan honoring this unique quality—"Snap! Crackle! Pop!"—was introduced around 1939 and is still used on packaging today. For decades, Rice Krispies has been one of the most popular cereals among consumers, so much so that even the Rolling Stones recorded a short song for a television commercial promoting the brand in 1964. Do you remember the catchy tune?

Image: Lisa Fotios

Cap'n Crunch cereal, a combination of corn and oats, was developed in the early 1960s by Pamela Low, a flavorist who was inspired by a brown sugar and buttered rice recipe from her grandmother. Since its debut, additional flavors have been introduced, including Berries, Peanut Butter, and Chocolate.

But did you know that Cap'n Crunch’s full name is Horatio Magellan Crunch? The iconic cartoon mascot was developed for the Quaker Oats Company by Allan Burns, a screenwriter and television producer who later co-created popular shows like The Munsters and The Mary Tyler Moore Show. Since its introduction in 1963, the late 18th-century naval captain, born on Crunch Island—a magical land in the Sea of Milk—has won the hearts (and bowls) of countless consumers across America.

Image: Samantha Gades

General Mills introduced Trix in 1954 as the first fruit-flavored cereal. Initially, it wasn’t marketed exclusively for kids, but because of the bright colors, it soon became a favorite among the little ones. When Trix was first launched, it featured round cereal balls in three flavors: "Raspberry Red," "Orange Orange," and "Lemony Yellow." It wasn't until 1991 that Trix became the first fruit-shaped breakfast cereal.

But as with other brands on this list, Trix is best remembered for its mascot rather than the cereal itself. In fact, the Trix Rabbit is one of the single longest-running ad campaigns in television history. Since the 1960s, the brand has kept the same character, the same slogan—"Trix are for kids!"—and the same storyline: the rabbit’s endlessly thwarted attempts to steal a box of cereal.

Image: Sascha Bosshard

If we talk about the sweetest cereals on the market, we cannot fail to mention Frosted Flakes. The concept and technology of a "frosted" cereal was developed in 1939 by Jim Rex, a salesman from Philadelphia who unfortunately didn’t have much success with his product Ranger Joe Wheat Honnies. The idea, though, was soon adopted by the breakfast cereal industry, and by 1952, Kellogg introduced Sugar Frosted Flakes to its lineup.

That same year, Kellogg launched a campaign featuring Tony the Tiger, Frosted Flakes’ famous mascot, who proudly declared, "Sugar Frosted Flakes are Grrr-reat! The slogan and the character became so popular in the United States that it's probably more quintessential than the cereal itself.

Image: Engin Akyurt

The mini marshmallows found in Lucky Charms, whose technical and copyrighted name is Marbits, were invented, along with the cereal, by General Mills product developer John Holahan in 1963. One morning, he cut up a few orange marshmallow Circus Peanuts, mixed them into a bowl of Cheerios, and was delighted with the result. The rest, as they say, is history.

Lucky Charms is inspired by Irish culture. Its mascot, Lucky the Leprechaun debuted on St. Patrick's Day in 1964. The successful combination of this endearing character, delicious shaped oat pieces, and colorful little marshmallows was quickly embraced by children around the world. Tasty, crunchy, and fun, this cereal has undeniably revolutionized American breakfasts forever.

Image: Céline Druguet

Toucan Sam has been a part of our lives for more than 60 years now. Kellogg’s iconic mascot—a blue, anthropomorphic toucan with the ability to smell Froot Loops from great distances—was introduced alongside the O-shaped cereal in 1963.

Froot Loops were developed after Kellogg attempted to displace General Mills' Cheerios from the market. The idea of introducing fruity flavors proved to be a success, even though, years later, the company admitted that the different colors did not correspond to unique fruit flavors. In recent years, Froot Loops have faced criticism for their use of artificial colorings and high sugar content. Yet, they still have plenty of fans and they remain one of the best-selling cereal brands in America.

Image: Yusuf Timur Çelik

Another popular breakfast cereal created by General Mills is Cinnamon Toast Crunch. In fact, the company sells over 100 million boxes a year of this brand alone, putting it just behind Cheerios and Frosted Flakes in sales. How about you—do you have a box of Cinnamon Toast Crunch waiting in your pantry?

These delicious little squares of whole wheat and rice, topped with cinnamon and sugar, were first launched in 1984 and were an instant hit. And it makes sense, given that, in a way, they were invented by a child. Cinnamon Toast Crunch was developed by General Mills scientists and product managers after an unnamed child suggested the idea of a cinnamon toast-flavored cereal during a radio contest. Since then, it has remained one of America's favorite cereals and we don't expect its popularity to wane any time soon.

Image: Francisco Jacquier

More than 60 years after its creation, Life remains one of the top 10 best-selling cereal brands in the United States. Introduced on the market in 1961 by the Quaker Oats Company under the slogan "The most useful protein ever in a ready-to-eat cereal," Life is a multigrain cereal enjoyed by millions of family households across the country.

Like its competitor Trix, Life has also made history in marketing and advertising. A famous Life commercial featuring Little Mikey, a hard-to-please four-year-old boy, aired nationally from 1972 to 1984, making it the longest-running commercial in television history. Have you seen it? We bet you have!

Image: Binyamin Mellish