Place Instant Pot to Saute setting. Add Olive oil and cornstarch coated beef cubes. Fry each side until golden brown. Remove and set aside. In same pan, add all chopped vegetables (carrots, onion, and celery) and saute until soft. Add minced meat until browned.
Once browned, turn off saute setting and add all seasonings (Italian, salt, and pepper), wine, beef stock, tomato paste, and tomato sauce. Stir well. Place lid and set to manual for 50 minutes on high pressure. Make sure nozzle is set to sealing. After 50 minutes, release pressure naturally and slow cook for 2 more hours.
Bechamel:
Add butter to a heavy bottomed sauce pan and melt until bubbling.
Add flour and stir continuously until a paste forms. Cook for 1 minute until slightly brown and has a nutty scent.
Whisk in milk slowly and stir continuously until mixtures starts to thicken. Add all remaining ingredients. Whisk until cheese is completely melted and sauce coats the back of a spoon. Set aside.
Lasagna: Preheat oven to 350°
Place a bit of the ragu on the bottom of the pan. Add Lasagna noodles evenly across. Add ragu on top of noodles and then the bechamel. Sprinkle Mozzarella on top of bechamel. Repeat process until last layer. Top with remaining cheese.
Spray tin foil with a little cooking spray and tent foil over lasagna * fold foil in half and crease. Cook for 45 minutes. Remove foil and place broiler on low for 5 minutes to get the bubbly golden texture. Remove and enjoy!