Creating Mushroom Shepherd’s Pie is straightforward when you follow these simple steps:

1. Preheat the Oven: Start by preheating your oven to 400°F (200°C).
2. Sauté Vegetables: In a large skillet, heat olive oil over medium heat. Add onions, carrots, and celery. Sauté until softened, about 5-7 minutes.
3. Add Garlic and Mushrooms: Stir in the minced garlic and chopped mushrooms. Cook until the mushrooms release their moisture and become tender, about 5-7 minutes.
4. Season the Mixture: Add the vegetable broth, soy sauce, thyme, rosemary, salt, and pepper. Cook for an additional 5 minutes until the mixture thickens slightly.
5. Stir in Peas: Add the peas to the mushroom mixture and stir until combined. Remove from heat.
6. Prepare the Baking Dish: Transfer the mushroom mixture to a baking dish, spreading it evenly.
7. Top with Mashed Potatoes: Spoon the mashed potatoes over the mushroom filling, smoothing it out with a spatula. You can create peaks with a fork for a crispy top.
8. Bake: Place the dish in the preheated oven and bake for 30-35 minutes or until the top is golden brown.
9. Cool: Remove the pie from the oven and allow it to cool for about 10-15 minutes before serving.

These steps will guide you in creating this incredible Mushroom Shepherd’s Pie effortlessly.