Stuffed Mini Pizza Buns

Ingredients

• 375 g Type 45 flour
• 3 g Baking powder
• 12 g Fresh baker's yeast
• 5 g Sugar
• 2 1/2 g Salt
• 1 unité Egg white
• 1 unité Egg yolk
• 40 g Sunflower oil
• 5 ml White vinegar
• 200 ml Warm milk
• 30 g Unsalted butter
• 1/2 unité Red bell pepper
• 1/2 unité Green bell pepper
• 50 g Onion
• 100 g Button mushrooms
• 30 ml Olive oil
• 2 unité Garlic cloves
• 200 g Canned diced tomatoes
• 15 g Tomato paste
• 2 g Dried oregano
• 50 g Grated Emmental cheese
• 50 g Grated mozzarella
• 50 g Canned tuna