Creating French Onion Beef Stew with Cheesy Bread Topping is straightforward when you follow these steps:

1. Sear the Beef: In a large heavy pot or Dutch oven, heat the olive oil over medium-high heat. Season the beef cubes with salt and pepper. Add them to the pot in batches, searing all sides until browned. Remove the beef and set it aside.

1. Caramelize the Onions: In the same pot, add butter. Once melted, add sliced onions. Reduce heat to medium-low and cook for about 30-40 minutes, stirring occasionally until they are deeply caramelized and golden brown.

1. Add Garlic: Stir in minced garlic and cook for an additional 1-2 minutes until fragrant.

1. Combine Ingredients: Return the browned beef to the pot. Stir in tomato paste, wine (if using), beef broth, thyme, and bay leaves. Bring the mixture to a gentle simmer.

1. Slow Cook: Reduce heat to low, cover the pot, and let it simmer for about 1.5 hours, or until the beef is tender.

1. Prepare the Bread Topping: While the stew is cooking, preheat your oven to 400°F (200°C). Slice the baguette into 1-inch thick slices. Place the slices on a baking sheet, brush with olive oil, and sprinkle some salt.

1. Toast the Bread: Bake the bread in the preheated oven for 5-7 minutes, or until lightly toasted.

1. Add Cheese: After the stew has finished cooking, remove the thyme and bay leaves. Taste and adjust the seasoning if necessary. Ladle the stew into oven-safe bowls, topping each with toasted bread slices and a generous amount of shredded Gruyère cheese.

1. Melt the Cheese: Place the bowls on a baking sheet and return to the oven. Bake for 10-12 minutes, or until the cheese is melted and bubbly.

1. Garnish and Serve: Remove from the oven, garnish with chopped fresh parsley, and serve hot.

With these steps, you can create a sumptuous French Onion Beef Stew with Cheesy Bread Topping that is sure to warm your heart and satisfy your appetite!