Fuck yes flan.
Preheat oven to 175C/350F.
Separate eggs and set yolks aside. Beat whites until they form peaks. Slowly add all the evaporated milk and 1/2 cup of sugar while mixing on medium speed. Slowly add yolks and mix until even.
Take the remaining 1/4 cup of sugar and caramelize it. Heat it in a pan until it melts. Coat the bottom of whatever vessel your flan will cook in.
Add egg mixture and place in double-boiler. Cover flan with foil and bake 45 minutes to however long it takes that sticking a knife in comes out clean.