This Zesty Asparagus and Mushroom Casserole is a vibrant, flavorful dish that brings together fresh, earthy vegetables with a creamy, zesty sauce. Perfect for a weeknight dinner or as a standout side at your next gathering, it’s a delightful way to celebrate the bounty of the season.
Asparagus adds a fresh, slightly sweet flavor and a nice crunch to the casserole. Cremini mushrooms bring a deep, earthy taste that complements the asparagus perfectly. Onion and garlic provide a savory base, enhancing the overall flavor profile. Heavy cream and sour cream create a luscious, creamy sauce, while Parmesan cheese adds a salty, nutty richness. Lemon zest gives a bright, zesty kick that cuts through the creaminess. Olive oil is used to sauté the vegetables, adding a fruity flavor. Fresh thyme, salt, and black pepper season the dish perfectly. Finally, breadcrumbs and fresh parsley make for a crunchy, herby topping.
This casserole pairs wonderfully with a crisp green salad dressed in a simple vinaigrette to balance the richness. It also complements grilled chicken or a roasted salmon fillet beautifully if you're looking to add some protein to your meal.
First things first, preheat your oven to 350°F (175°C). While that’s warming up, grab a large skillet and heat up two tablespoons of olive oil over medium heat. Toss in your diced onion and minced garlic, letting them sauté until they’re soft and fragrant. This should take about 3–5 minutes.
Next, add the sliced cremini mushrooms to the skillet. Cook them until they release their moisture and start to brown, which usually takes about 5–7 minutes. Then, stir in the asparagus pieces and let them cook for another 3 minutes — just enough to keep them crisp yet tender.
In a separate bowl, whisk together the heavy cream, sour cream, Parmesan cheese, lemon zest, fresh thyme, salt, and black pepper. Pour this creamy mixture over the vegetables in the skillet, stirring everything together to ensure the veggies are well-coated.
Transfer the creamy vegetable mixture into a greased 9x13 inch casserole dish. In a small bowl, combine the breadcrumbs with chopped fresh parsley, and sprinkle this mixture evenly over the top of the casserole. This will create a lovely crunchy topping once baked.
Pop the dish into the preheated oven and bake for 25–30 minutes. You'll know it’s ready when the top is golden brown and bubbly. Let it cool slightly before serving.
Share