Preheat the oven to 425°F.
In a bowl, whisk together all the ingredients for the stir fry sauce. Set aside.
1/2 cup soy sauce, regular or low sodium, 1/4 cup brown sugar, 2 cup chicken broth, or beef, 2 garlic cloves , minced, 2 Tbsp cornstarch, 1 tsp sesame seeds , optional
Prepare and thinly slice the bell peppers and quarter the mushrooms. (Be sure the peppers are sliced in the same size for even cooking.)
1/2 red bell pepper, 1/2 yellow bell pepper, 4 oz mushrooms, 1 cups small broccoli florets
Slice the steak into even-sized thin slices. (For easier slicing, add the steak into the freezer for 10-15 minutes before cutting.)
1/2 lb flank steak , or sirloin
Season the steak with salt and pepper.
¼ tsp salt, ¼ tsp ground black pepper
Pour the homemade stir fry sauce into a 9x13 baking sheet. (Be sure to pour everything, even the slurry that’s on the bottom of the bowl.)
Break the ramen noodles, creating 4 squares. Add it into the baking sheet, spreading around the stir fry sauce.
2 packs instant ramen noodles, discard the seasoning pack
Top with the peppers, mushrooms, broccoli and seasoned steak, spread all over the sheet pan.
Cover the sheet with foil and carefully transfer it to the oven. (Be careful not to spill the sauce.)
Bake covered at 425°F for 20 minutes. Remove the foil and bake for another 5 minutes, uncovered.
Remove from the oven and mix everything until well combined and coated in the sauce. Top with fresh green onions and sesame seeds.
Serve immediately with desired sides.