Slice the beef, potatoes, onion, and green bell pepper into thin pieces to ensure even cooking and tender results.
Place half of the potato slices evenly in the bottom of the crockpot to form a solid base.
Layer half of the sliced onions and bell peppers on top of the potatoes, followed by half of the beef slices.
Sprinkle half of the garlic powder, salt, and black pepper over the layered ingredients.
Repeat by adding the remaining potatoes, onions, bell peppers, and beef slices, then season with the rest of the spices.
Pour the beef broth over the top layer and drizzle the olive oil evenly across the casserole.
Cover and cook on low for about 4 hours until the potatoes are soft and the beef is fully cooked.
Toward the end of cooking, sprinkle the shredded provolone cheese over the top and allow it to melt before serving.