In a bowl of a stand mixer, add the yeast to the warm milk and let it set for 3 – 4 mins. Add sugar, egg yolks, vanilla and half of the flour. Using the dough hook, knead on medium speed for 2 – 3 mins. Add butter then the rest of the flour and mix until you have a soft dough. Make sure not to over mix.
Allow the dough to rise until it doubles in volume. This depends on the temperature of your kitchen. I let mine set for 30 minutes, but it could take you an hour or more if your kitchen is cold.
Line a 20X30 cm baking pan with parchment paper. Once dough has doubled in volume, roll it to fit in the prepared pan. Allow the dough to rise again in the pan.
Meanwhile preheat oven to 200°C.
Top the dough with the sliced strawberries and then sprinkle with the streusel.
Bake for 12 minutes.
Allow to cool slightly. Can be enjoyed warm, at room temperature.