Simple yet Delicious Potato Mushroom & Onion Gratin

Ingredients

• 1 large red onion
• 1 pack of sliced mushroom or about 2 cups
• 1 1/2 lb small potatoes or you
• 2 tbsp bread crumbs
• 1 tbsp olive oil
• 1 tsp thyme or to taste
• 1 tsp basil or to taste
• 1 tsp ground black pepper or to taste
• 1 splash of soy sauce
• 1/2 cup shredded cheese
• 1 cup cream or double cream
• 1 egg
• 1 tbsp white flour