Leeks, mushrooms, and cheddar come together beautifully in this crustless oat pie that’s both satisfying and surprisingly simple. If you’re looking for a savory dish that feels substantial without relying on heavy pastry, this recipe is a quiet winner. The combination of sautéed leeks and mushrooms softens into a rich base, while oat flour adds just enough body without overwhelming the flavors. Using yogurt keeps the pie tender and moist but balanced, and the cheddar contributes a welcome sharpness that melts on top. This pie is ideal for a light lunch, brunch, or a comforting dinner, especially when you want something that holds up well without fuss.
If you’ve enjoyed rustic veggie pies before, you might appreciate how the oat flour here creates a slightly nutty texture without the density of traditional wheat crusts. For a similar approach with different veggies, try the crispy grated potato pie with spinach and mushrooms, which also highlights a clever way to enjoy vegetables in pie form without pastry.
Why You’ll Love This Recipe
- Combines simple, wholesome ingredients into a nourishing, crustless pie.
- Oat flour offers a gluten-free alternative that adds a subtle, nutty flavor and light texture.
- Cheddar cheese melted on top creates an appealing golden crust with a burst of savory richness.
- Uses plain yogurt instead of heavier creams, keeping the filling tender and not overly rich.
- Leeks and mushrooms sauté until perfectly soft, offering deep, gentle earthiness.
- The pie holds its shape well without a crust, making portioning hassle-free.
Ingredients
- 2 medium leeks, thinly sliced
- 8 ounces (225 g) mushrooms, chopped
- 1 tablespoon (15 ml) olive oil
- 4 large eggs
- 1 cup (240 ml) plain yogurt
- 3/4 cup (90 g) oat flour
- 1 teaspoon (4 g) baking powder
- 1 cup (100 g) shredded cheddar cheese, divided
Ingredient Notes
Leeks have a milder, sweeter flavor than onions and become tender and fragrant when cooked, making them perfect for this dish. Mushrooms add an earthy, umami dimension and moisture to the mixture. Oat flour is a fantastic gluten-free choice here; it’s unrefined enough to add some texture but still creates a smooth filling. Yogurt is key to achieving a moist and tender consistency without heaviness—plain Greek or regular yogurt both work well. The cheddar cheese not only flavors the mix but also forms a delicious crust on top when baked.
If you can’t find oat flour, you could pulse rolled oats in a food processor until fine, but be careful not to over-process into powder. For cheese, mild or sharp cheddar both bring a nice balance of flavor.
Kitchen Tools Needed
- 9-inch (23 cm) pie dish
- Large skillet or frying pan
- Mixing bowl
- Whisk or fork
- Measuring cups and spoons
- Spatula or wooden spoon
Step-by-Step Instructions
- Preheat your oven to 375°F (190°C). Grease a 9-inch (23 cm) pie dish lightly with oil or nonstick spray to prevent sticking.
- Heat the olive oil in a large skillet over medium heat. Add the sliced leeks and chopped mushrooms. Cook for 8–10 minutes, stirring occasionally, until the vegetables are soft and any released liquid has evaporated. The pan should be dry to avoid a soggy pie.
- In a mixing bowl, whisk together the eggs and plain yogurt until smooth. Stir in the oat flour and baking powder to combine, then fold in half of the shredded cheddar cheese.
- Add the cooked leeks and mushrooms to the batter, mixing gently but evenly. Pour the mixture into your prepared pie dish, spreading it out evenly.
- Sprinkle the remaining cheddar cheese on top for a nice golden finish.
- Bake in the preheated oven for 30–35 minutes. The pie should puff up slightly, be set in the center, and develop a golden-brown top.
- Let the pie rest for about 10 minutes before slicing to allow it to set fully and make cutting easier.
Pro Tips
- Sauté the leeks and mushrooms until the skillet is dry; excess moisture can make the pie too wet and prevent it from setting properly.
- Use a good quality cheddar with enough flavor—something too mild won’t create the same comforting depth.
- If your oven tends to bake unevenly, rotating the pie halfway through baking ensures the top browns evenly.
- Letting the pie cool before cutting helps maintain its shape and makes serving neater.
- For a little extra flavor, consider adding some fresh herbs like thyme or parsley to the vegetable mix.
Common Mistakes
- Not cooking the vegetables long enough, leaving them wet and causing a soggy pie.
- Skipping the rest time after baking, which can make the pie crumble when slicing.
- Using too much oil or butter during sautéing, which can weigh the pie down.
- Overfilling the pie dish, leading to uneven cooking and difficulty in setting.
- Not mixing the batter thoroughly, resulting in lumps of flour or baking powder.
Variations
- Swap the cheddar for Gruyère or mozzarella for a different flavor profile.
- Add a handful of fresh spinach or kale for some greens and extra vitamins.
- Stir in a teaspoon of smoked paprika or chili flakes for warmth and kick.
- Replace mushrooms with sautéed zucchini or bell peppers for a twist.
For a delightful alternative that uses oats differently, this flourless oatmeal and carrot pie recipe offers another way to embrace oats in savory baking.
Serving Suggestions
This crustless oat pie works wonderfully warm or at room temperature. Serve it as a comforting lunch with a crisp green salad or alongside roasted root vegetables for a heartier meal. It also pairs nicely with a simple tomato chutney or a tangy yogurt dip to add brightness.
Storage Instructions
Store any leftovers covered in the refrigerator for up to 3 days. The pie keeps well and actually develops more flavor as it sits.
Reheating Tips
Reheat slices gently in a 350°F (175°C) oven for 10–15 minutes or until warmed through to keep the texture intact. Avoid microwaving if possible, as it can make the pie rubbery.
Nutrition Estimate (per serving, serves 6)
- Calories: 210
- Protein: 14 g
- Carbohydrates: 12 g
- Fat: 11 g
Recipe Summary
Prep Time: 15 minutes
Cook Time: 30–35 minutes
Total Time: 45–50 minutes
Servings: 6
Cuisine: Comfort / Vegetarian
Course: Main dish or brunch
Calories: 210 per serving
Frequently Asked Questions
Can I use regular flour instead of oat flour?
Yes, regular all-purpose flour works but will change the texture slightly. Oat flour adds a nuttier flavor and lighter feel.
Is this pie gluten-free?
It can be if you use certified gluten-free oat flour and ensure all other ingredients are gluten-free.
Can I make this pie ahead of time?
Absolutely. Prepare it fully, refrigerate, and reheat before serving.
What can I use instead of yogurt?
Sour cream or crème fraîche can substitute nicely, adding a similar creamy tang.
Can I freeze this pie?
Yes, after cooling, wrap it well and freeze for up to 2 months. Thaw in the fridge before reheating.
This leek, mushroom, and cheddar crustless oat pie is a practical way to enjoy a comforting, vegetable-rich meal with minimal fuss. Its balanced texture comes from careful cooking of the vegetables and the unique use of oat flour, making it a standout in everyday cooking.
