Creating Chicken Madeira is simple when you follow these structured steps:

1. Season the Chicken: Sprinkle salt and pepper on both sides of the chicken breasts.
2. Heat Oil: In a large skillet, heat the olive oil over medium-high heat.
3. Brown Chicken: Add the chicken breasts to the skillet and cook for 5-7 minutes on each side until golden brown. Remove the chicken and set aside.
4. Sauté Mushrooms: In the same skillet, add the sliced mushrooms and cook for about 4-5 minutes until they become tender.
5. Add Garlic: Stir in the minced garlic and cook for another minute until fragrant.
6. Deglaze with Wine: Pour in the Madeira wine to deglaze the pan, scraping up any browned bits. Bring it to a simmer.
7. Add Broth and Soy Sauce: Mix in the chicken broth and soy sauce, continuing to simmer for about 5 minutes.
8. Return Chicken: Place the browned chicken breasts back into the skillet and reduce the heat to low. Cover and cook for another 15-20 minutes until the chicken is cooked through (internal temperature of 165°F).
9. Thicken Sauce (optional): If you prefer a thicker sauce, whisk cornstarch with a tablespoon of water, then stir it into the sauce for the last few minutes of cooking.
10. Finish with Butter: Remove from heat and stir in the butter for a luscious, shiny sauce.
11. Garnish and Serve: Garnish with freshly chopped parsley before serving.

These straightforward steps will guide you in preparing an incredible Chicken Madeira that brings pleasure to your table.