Preheat oven to 375F and grease a 9x13 casserole dish.

In a large pan, heat avocado oil over high heat. Add steak and cook until no longer pink. Move steak to separate bowl.

In the same pan the steak was in, add the sliced onions, mushrooms, salt and pepper. Cook over high heat for about 6-8 minutes or until onions have started to caramelize and mushrooms are soft.

Add in garlic and cook for another minute. Turn off heat.

In the bowl with the steak, add ¾ cup blue cheese dressing and stir until steak is coated.

Cut Hawaiian rolls in half long way, like cutting through a sheet cake. Place bottom of rolls into casserole dish.

Add beef to the base of the rolls, then top with the onions and mushrooms. Top with shredded cheese. Place rolls top part on.

Brush with melted butter and sprinkle poppy seeds on top.

Bake for 20 minutes. Let rest 10 minutes before serving.