Prepare a checklist. Keep ingrdients close by

Preheat the oven 180 c
I used a baking tray 9 inch x 9 inch x 4inch
Spray oil on the inner surface of the baking tray
1st group Build the Layers
1layer: spread 1 ½ c of tomato basil sauce plus ½ tsp Italian spice mix evenly at the bottom
Layer2: Arrange 3 Lasagna noodles on the top of the sauce

Layer3 : spread 1 ½ c of tomato basil sauce plus ½ tsp Italian spice mix
Layer4:: Arrange 3c spinach with ½ c ricotta cheese on the previous layer
Layer5:: spread 1 ½ c of tomato basil sauce plus ½ tsp Italian spice mix.
Layer6 arrange 2c mushrooms slice on the top of the sauce
Layer 7 sprinkle 1 c Parmesan cheese

Repeat layers 1 to 7

Top with left over tomatro sauce plus 1tsp Italian spice mix
Top with the left over parmesan cheese, sprinkle chilli flakes on the top.
Bake, cover with aluminum foil for 15 minutes, then remove the foil and bake for another 10 minutes. The whole house gets filled with aroma

Let the baked lasagna rest. Cool in the refrigerator at least for 3-3 hours. Doing so helps it firm up and hold its shape when you cut into it to serve.
Plus, it gives it a chance to cool down enough to enjoy! Slice with a knife.
You may serve chilled or microwave the slice for 30 seconds and serve