Prepare the Improver: Mix flour, baking powder, yogurt, and honey until well combined.
Mix Dry Ingredients: In a mixer, combine flour, yeast, powdered milk, and salt.
Combine Mixtures: Add the improver mixture to the dry ingredients and knead.
Add Eggs and Knead: Incorporate egg whites and yolk, then knead for about 10 minutes.
Add Butter and Oil: Add butter and oil, continue kneading until dough is stretchy.
Ferment the Dough: Place dough in a greased dish, cover, and let it ferment for 2 hours.
Shape the Dough: Divide dough into 100g pieces, roll into balls and cover.
Roll and Fill: Roll out each ball, spread with butter, sprinkle flour, roll up.
Shape Pastries: Shape into desired forms (pate, croissant) and place on a greased tray.
Coat and Bake: Coat with egg mixture and bake in a preheated oven until golden.
Brush with Jam: Brush with jam after baking for added flavor.