Warm the tigelle in a non-stick pan or toaster, then let them cool.

Meanwhile, mix the Greek yogurt with chocolate chips. Add sweetener to taste.

Fill the tigelle with a generous layer of yogurt and place them in the freezer for 10 minutes to solidify. Once ready, roll the filled tigelle in various decorations: chopped hazelnuts, sprinkles, and chocolate chips.

Serve at room temperature and finish with a birthday candle.