Preheat oven to 400°F (200°C). Slice the baguette into 1-inch thick pieces and place on a baking sheet. Toast in the oven for 5–7 minutes until golden and crispy.

Meanwhile, heat olive oil in a large skillet over medium-high heat. Season steak cubes with salt and pepper, then cook for 3–4 minutes, turning occasionally, until browned and cooked to your desired level of doneness. Remove steak from skillet and set aside.

In the same skillet, melt butter over medium heat. Add minced garlic, Italian seasoning, and red pepper flakes (if using), and cook for about 1 minute until fragrant.

Return the steak bites to the skillet, tossing them in the garlic butter until well coated.

Top each toasted bread slice with a few steak bites, sprinkle with Parmesan cheese, and garnish with fresh parsley. Serve immediately.