Dinner

Creamy Vegetarian Tater Tot Casserole Recipe

Bylina moretti October 17, 2026October 17, 2026

Introduction

This Creamy Vegetarian Tater Tot Casserole is a comforting and hearty dish perfect for family dinners. Loaded with vegetables, lentils, and topped with crispy tater tots, it’s both flavorful and satisfying. Plus, it’s easy to prepare, making it a great choice for a cozy meal.

A close-up of a white rectangular baking dish filled with a layered casserole. The bottom layer contains a mix of cooked ground meat and small pieces of colorful vegetables like orange carrots and green peas in a creamy sauce. On top, there is a neat grid of golden-brown crispy tater tots, arranged in perfect rows, covering the entire surface. The tater tots are evenly browned with a crunchy texture. The dish sits on a white marbled surface. photo taken with an iphone --ar 4:5 --v 7

Ingredients

2 tbsp unsalted butter, plus extra for the dish
1 medium yellow onion, diced
2 garlic cloves, minced
1 (10.5 oz) can condensed cream of mushroom soup
½ cup sour cream
½ cup whole milk
1 cup shredded sharp cheddar cheese, divided
1 (10 oz) bag frozen mixed vegetables
1 (15 oz) can lentils, drained and rinsed
1 tsp salt
½ tsp black pepper
1 (32 oz) bag frozen tater tots, not thawed

Instructions

Step 1: Preheat the oven to 375°F and butter a 9×13-inch baking dish. In a skillet, sauté the diced onion in 2 tablespoons of butter over medium heat for about 5 minutes, until softened. Add the minced garlic and cook for an additional 30 seconds, stirring frequently.
Step 2: Reduce heat to low and whisk in the condensed cream of mushroom soup, sour cream, and whole milk. Stir until the mixture is smooth and heated through, about 2 minutes. Remove from heat.
Step 3: Stir the frozen mixed vegetables, drained lentils, half of the shredded cheddar cheese, salt, and black pepper into the creamy mixture until well combined.
Step 4: Spread the filling evenly in the prepared baking dish. Arrange the frozen tater tots in a single layer on top of the filling.
Step 5: Bake the casserole for 35 to 40 minutes, or until the tater tots are deep golden brown and the filling is bubbling. If desired, sprinkle the remaining cheddar cheese over the top during the last 5 minutes of baking. Let the casserole rest for 5 minutes before serving.

Tips & Variations

For extra flavor, add a teaspoon of smoked paprika or a dash of hot sauce to the filling mixture.
Use a mix of your favorite vegetables such as corn, peas, and carrots instead of frozen mixed vegetables.
Try substituting lentils with cooked chickpeas or black beans for a different texture and taste.
To make it vegan, substitute butter with plant-based margarine, use a dairy-free cream of mushroom soup, sour cream alternative, and vegan cheese.

Storage

Store leftovers in an airtight container in the refrigerator for up to 3 days. Reheat individual servings in the microwave or warm the entire casserole in a 350°F oven until heated through. For best texture, avoid reheating multiple times as tater tots can become soggy.

How to Serve

A white rectangular baking dish filled with a casserole featuring a bottom layer of mixed vegetables and ground meat in a creamy sauce, showing colors like orange, green, and brown. On top, there are neatly arranged golden brown, crispy tater tots placed in rows, forming a textured and crunchy upper layer. The tater tots have a slightly rough surface with a toasted look, and the dish is set on a white marbled surface. photo taken with an iphone --ar 4:5 --v 7

Serve this delicious recipe with your favorite sides.

FAQs

Can I use fresh vegetables instead of frozen?

Yes, you can use fresh vegetables. Just steam or sauté them briefly before adding to the filling to ensure they cook through properly during baking.

Can I prepare this casserole in advance?

Absolutely. You can assemble the casserole up to a day ahead, cover it tightly, and refrigerate. Bake it just before serving, adding a few extra minutes to the baking time if baking straight from the fridge.