Place the flour in a mixing bowl and make a well in the middle. Add the yeast with 1/2 the milk and mix well. Cover and let rise 15 minutes.
Add melted butter, remaining milk, egg and salt then knead well to make a smooth dough. Preheat oven to 50 degrees C, turn the oven off and place the dough inside, covered. Let rise 15 minutes. Knead again and let rise another 15 minutes.
Divide the dough into parts and form a rabbit with a body, head, ears, feet and tail. Brush the contact surfaces with a little water to help them stick. Place on a greased baking tray and let rise 30 minutes in a warm place. Preheat oven to 180 degrees C.
Beat the egg yolk and brush over the bunny. Decorate with seeds if you, then bake 20-25 minutes until golden brown.