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Preheat oven at 220°C (~425°F). Butter then flour the inside of two 10 cm diameter ramekins and set aside.
In a bowl, whisk egg + egg yolk and sugar until well incorporated, set aside
In a double boiler add butter, white chocolate and ube halaya, mix as it melts, and remove from heat when completely melted and mixed together
Add ½ of white chocolate mix to bowl of whisked egg yolks and mix it into the egg yolks. Repeat step one more time. Add in tablespoon of flour and the ube extract then mix until smooth.
Pour into prepared ramekins and bake in preheated oven for about 8 minutes or until outer rim is cooked but the batter is still jiggly in the middle
Flip onto a plate. Sprinkle powdered sugar on top and serve immediately.