Grease 9 inch pyrex with melted butter, set aside
Beat eggs sugar, essence and milk until completely combined
Tear up burger buns and place it on pyrex, sprinkle with toffee bits and choc chips
Pour in milk mixture, chill for an H if not overnight
Bake on preheated 400 F for 30-45 mins
Take out pyrex from oven, let stand 8-10 mins, slice and serve