Spread tater tots evenly onto baking sheet and bake in preheated oven for 10-15 minutes or until to desired level of crispiness. Baking tater tots before putting them in the hotdish is highly recommended, but not required.
Heat olive oil in a large, oven-safe dutch oven over medium-high heat. Add garlic and onion to dutch oven and saute until onion is translucent, about 2-3 minutes.
Add the mushrooms and plant-based crumbles and saute until mushrooms are softened and crumbles are heated through, about 2-3 minutes.
Add ground black pepper and all-purpose flour and stir until the contents of the dutch oven are evenly coated.
Add the soy milk and stir until the mixture comes to a boil. Once mixture is boiling, turn off heat.
Arrange tater tots on top of the veggie mixture. Cover the dutch oven, and bake in preheated oven for 45-50 minutes, or until hotdish is golden-brown. Remove cover for the final 10 minutes of baking.
Let hotdish sit for 5 minutes before serving.
Notes
I use my Le Creuset enameled cast iron dutch oven for this recipe so that I can saute and bake in the same dish, but you could also use a glass casserole dish to bake your hotdish or an oven-safe stock pot or deep skillet.