1: Boil a pot of water, add oil and salt when it comes to a boil, add the pasta sheets and cook.

2. Cook the pasta until it is soft and tender to the touch, then remove it from the pot and place it in cold water to cool.

3: Brush the bottom of a heat-resistant container with oil to prevent sticking, and add one pasta sheet.

4: Add a layer of red sauce and a slice of cheddar cheese.

5: Add another pasta sheet, white sauce and black pepper mushrooms.

6: Fill it up in order and add the last layer of red sauce with grated mozzarella.

7. Preheat oven to 200 degrees Celsius on top and 180 degrees Celsius on the bottom, place in the top layer of the oven and bake for 20 minutes until the cheese is colored. Because the lasagna ingredients are cooked, just heat and bake the cheese. So put it on the top layer and the top heat can be higher. That's the benefit of having separate temperature controlled ovens!