Follow these easy steps to create your Vegetarian Shepherd’s Pie:

1. Preheat the Oven: Preheat your oven to 400°F (200°C).
2. Sauté Vegetables: In a large skillet, heat the olive oil over medium heat. Add diced onion and carrots; sauté until softened, about 5-7 minutes.
3. Add Garlic and Mushrooms: Stir in minced garlic and chopped mushrooms. Cook for another 5 minutes, until the mushrooms have released their juices.
4. Incorporate Peas and Lentils: Add frozen peas and cooked lentils to the skillet. Mix well and cook for 2-3 minutes.
5. Seasoning: Stir in the tomato paste and dried thyme. Season with salt and pepper to taste.
6. Prepare a Baking Dish: Transfer the vegetable mixture to a greased baking dish, spreading it evenly.
7. Add Mashed Potatoes: Generously top the vegetable mixture with the prepared mashed potatoes, spreading them out smoothly.
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 from the oven and let it cool for 10-15 minutes before serving.
10. Serve: Garnish with fresh herbs if desired and enjoy!