McDonald's CEO was just fired over a relationship with an employee. Here are 18 major changes he made during 4 years at the helm of the fast-food giant.

About a month after Easterbrook became CEO, McDonald's cut seven sandwiches from its menu to speed up order-fulfillment time. Cut items included the Deluxe Quarter Pounder burger, six chicken sandwiches, and the honey mustard and chipotle barbecue snack wraps, Bloomberg originally reported in 2015.

More recently, McDonald's has cut Signature Crafted Recipes burgers and sandwiches from the menu and slashed items from its late-night menu. Franchisees can also decide which menu items they want to include on the all-day breakfast menu.

The Create Your Taste option was introduced to thousands of restaurants nationwide in June 2015. The option let people order toppings like guacamole and chili-lime tortilla strips via touchscreen kiosks but was replaced by a new program called "Signature Crafted Recipe" in 2016. That program was discontinued earlier this year.

McDonald's announced that it would use real butter instead of margarine on its McMuffins, biscuits, and bagels in August 2015, helping to drastically drive up sales of those menu items.

The sandwich featured a chicken-breast fillet marinated and battered with buttermilk and topped with tomato, leaf lettuce, and mayonnaise. It's served on an artisan roll.

"It outperformed the high end of our expectations," Easterbrook said of the sandwich in October 2015.

The company tested the service in May 2015 and partnered with Postmates to bring food to customers in Brooklyn, Queens, and Manhattan 24 hours a day.

A partnership with UberEats brought McDonald's delivery to 5,000 US locations in 2017. Executives said delivery has helped attract new customers in younger, more urban regions.

In 2018, McDonald's delivery was available at 12,000 locations globally through the partnership with UberEats.

In September, McDonald's announced a partnership with Grubhub to expand delivery to approximately 500 restaurants in the New York City and Tri-State Area.

The chain rolled out an all-day breakfast menu nationwide in October 2015. Prior to that, the chain had stopped serving breakfast most days at 10:30 a.m.

Certain breakfast items like McGriddles and bagels were excluded from the all-day breakfast menu.

McDonald's tested kale as an ingredient in breakfast bowls in nine locations in Southern California and in a restaurant concept in Canada.

McDonald's said it would remove all antibiotics vital to fighting human infections from its chicken supply and numerous hard-to-pronounce ingredients from the grilled chicken used for sandwiches and wraps, which would be renamed "Artisan Grilled Chicken."

The new recipe was rolled out to 140 locations in March 2016 and contained more recognizable ingredients like lemon juice solids and rice starch as opposed to artificial preservatives.

The new recipe was later rolled out nationally the same year.

The McPick 2, which launched in January 2016, replaced the chain's Dollar Menu that had been killed in 2014.

The deal allowed customers to choose two of the following items for $2: a McDouble, a McChicken, small fries, and mozzarella sticks.

In 2018, McDonald's officially debuted a new take on the Dollar Menu — the $1 $2 $3 menu — which gave customers a roughly 15% price cut on certain items.

McDonald's added the McCafe menu in September 2017, including a caramel macchiato, a vanilla cappuccino, and an americano. Executives said the new items prompted more orders from the breakfast food menu.

McDonald's introduced the Buttermilk Crispy Tenders in October 2017 after it cut Chicken Selects in 2015.

The tenders were a huge hit.

McDonald's announced in March 2018 that it would be rolling out Quarter Pounder burgers made with fresh — not frozen — beef across the US.

One year after the change, McDonald's grew its share of burger sales for the first time in five years.

"Our numbers speak for themselves, with the introduction of fresh beef and the promotions including fresh beef quarter-pound burgers helping result in a sustained quarter-pound burger sales increase of 30% on average throughout the entire first year," Chris Kempczinski, then-president of McDonald's USA, said in a statement.

By the end of 2017, all US McDonald's were planning to offer mobile order-and-pay.

The new, renovated "restaurants of the future" included kiosks and optional table service and were introduced as early as 2015.

"We are continuing to make improvements inside our restaurants to make the customer experience more personal and less stressful," Easterbrook said in 2017.

The company opened its new headquarters in Chicago's West Loop neighborhood in 2018 after 47 years in Oak Brook, Illinois.

"We firmly believe that part of the importance of the move downtown is that it gets us closer to our customers, it gets us closer to competition, it gets us closer to the trends in ... society," Easterbrook said at a ceremony to mark the move, USA Today reported.

McDonald's acquired two tech startups — Apprente and Dynamic Yield — with the intention, in part, of fixing its drive-thru business. It also invested millions of dollars in upgrading drive-thrus to speed up wait times, the company announced in September.

Easterbrook said McDonald's drive-thru times dropped by 20 seconds over the most recent quarter in a call with investors in October.

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