Preheat oven to a moderate baking temperature
Heat olive oil in a large skillet over medium-high heat
Add sliced onions and bell peppers
Sauté until tender and lightly caramelized
Remove vegetables from skillet and set aside
Add sliced steak to the skillet
Season with garlic powder, salt, and black pepper
Cook until beef is browned but still juicy
Return cooked peppers and onions to the skillet
Pour beef broth and heavy cream into the mixture
Stir to combine and simmer briefly
Transfer mixture into a casserole dish
Sprinkle shredded cheese evenly over the top
Bake until cheese is melted and bubbly
Remove from oven and let rest briefly
Serve warm and enjoy
