Whether you are sticking to meatless Mondays or eat plant-based every day, this vegan version of shepherd’s pie will satisfy any cravings for that warming winter classic. It looks just like the meat version and tastes just as good. We streamlined the process (including using frozen peas and carrots and baking the pie in the same skillet used to cook the vegetables) to make the dish as accessible and weeknight-friendly as possible. Note that although a food processor chops the mushrooms really fast, you can use a knife, if you prefer.
Combine the potatoes and garlic in a medium saucepan and cover with 2 inches of water. Season generously with salt and bring to a boil over high heat, then reduce to a simmer. Cook until the potatoes are tender, about 20 minutes. Reserve 1 cup of the cooking water and then drain the potatoes. Return the potatoes and garlic to the saucepan and mash with a potato masher. Add 1/2 cup of the cooking water and the 1/3 cup olive oil and stir to combine. If needed, stir in more water until the potatoes are a spreadable consistency. Stir in the chives and season to taste with salt and pepper. Cover and set the mashed potatoes aside.
Pulse the mushrooms in a food processor until coarsely chopped. Heat the 2 tablespoons olive oil in a medium skillet over medium high heat until shimmering. Add the mushrooms, 1 teaspoon salt and several grinds of pepper and cook until all the moisture from the mushrooms has evaporated, about 8 minutes. Stir in the tomato paste and rosemary and cook, stirring occasionally, until the tomato paste is a bit darker, about 3 minutes. Stir in the broth, followed by the peas and carrots and bring to a simmer, about 4 minutes.
Remove from the heat, dollop all over with the mashed potatoes and spread the potatoes into an even layer with the back of a spoon or a spatula. Bake until golden on top and bubbling around the edges, about 25 minutes.
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