1-Getting started: Getting started with this mushroom casserole is as easy as preheating your oven and pulling together a few fresh items. Begin by setting your oven to 400°F and lightly greasing a 2-quart baking dish with olive oil to prevent sticking. This simple step ensures your dish comes out bubbly and perfect every time.

2-Cooking the mushrooms: Next, heat the 1/4 cup of olive oil in a large skillet over medium-high heat. Add the 32 ounces of sliced baby Bella or crimini mushrooms, 1 cup chopped onions, and 2 teaspoons kosher salt. Stir occasionally as they cook, letting the mushrooms release their liquid and evaporate most of it, which takes about 10 minutes. This process draws out the best flavors and keeps the texture just right.

3-Adding seasonings: Once that’s done, mix in the 1 tablespoon fresh minced garlic, 1/2 teaspoon black pepper, and 1/2 teaspoon dried thyme. Let it cook for another minute to blend the tastes. Then, transfer the mixture to your prepared baking dish and sprinkle on the 1 cup shredded Gruyere cheese. Pop it in the oven and bake for about 15 minutes until it’s hot and bubbly.

4-Finishing touches: For an extra touch, garnish with 1 teaspoon dried parsley before serving. If your dish is broiler-safe, you can broil it for 2-3 minutes to melt the cheese even more. The whole process takes just 10 minutes to prepare and 30 minutes to cook, totaling 40 minutes, making it a quick win for busy parents or students.