Cut steak into ½ inch pieces and place in a medium size bowl.
Sprinkle with salt and pepper and toss to coat evenly.
In a large cast iron pan, over medium heat, melt butter and add oil.
Once butter is melted and oil is hot, add in steak pieces.
Sear steak bites, stirring frequently to ensure all sides are getting seared.
Once steak is done, remove from pan and set aside.
In a medium skillet, over low-medium heat, add oil. Sauté onions, garlic, mixed veggies, and green onions. Remove from pan and set aside.
Add eggs into skillet and scramble. Chop into small pieces, remove from pan, and set aside.
Cook rice according to package directions and set aside.
In a large skillet, melt butter over low-medium heat. Add in steak, rice, eggs, vegetables, sesame seeds, pepper, and soy sauce. Mix well.
Cook over low-medium heat, stirring occasionally until heated through.