Yolanda Fernández de Cofiño

Fernández de Cofiño died in Guatemala City on 6 September 2021.

After her husband died, Fernández de Cofiño continued managing the restaurant chain; in 2006 she acquired the franchises for El Salvador, Honduras, and Nicaragua, establishing "McDonald's Mesoamérica". In 2018 she left the franchise management to her children, although she continued participating occasionally.

Fernández de Cofiño established the Ronald McDonald Foundation in Guatemala. This foundation supports children with severe malnutrition and other illnesses. The first McHappy Day in Guatemala was held in 1999; in this day, all the profit from Big Mac sales is destined for the foundation. The first Ronald McDonald House, which provides lodging for low-income families traveling to Guatemala City for medical treatment, was opened in 2005. Currently there are three Ronald McDonald Houses in Guatemala, all located close to the main public hospitals in the city.

In 1974, Fernández and her husband purchased the first McDonald's franchise for Guatemala. Fernández de Cofiño was involved in the business from the beginning. She focused on marketing the franchise as a family restaurant. To be better prepared, she attended Hamburger University in Oak Brook, Illinois and participated in seminars and conventions. While working in the restaurant, she noticed that the menu portions offered were too large for children. This led her to introduce the "Ronald Menu", which included a small hamburger, a small portion French fries and an ice cream, in addition to a toy. The idea was noticed by executives at the McDonald's corporate offices in the US, who advised her to present the menu in the World Franchisee Convention in 1977. McDonald's adopted the idea and implemented it worldwide in 1979, renaming it to "Happy Meal". Fernández de Cofiño received a "Ronald Award" from the corporation.

Fernández de Cofiño was born in Santiago de Chile, where she lived until she was 20 years old. In 1956 her father was appointed Chilean ambassador for Guatemala, so she relocated to Guatemala with the rest of her family. In Guatemala she met and later married José María Cofiño Valladares; they had five children together.

Yolanda Fernández de Cofiño (29 July 1934 – 6 September 2021) was a Chilean-Guatemalan businesswoman and philanthropist. She managed the McDonald's franchise in Guatemala from its start in 1974 and is recognized for having introduced a concept for a small children's menu to the company that would lead to the creation of the "Happy Meal".