Ingredients
- 4 tbsp of butter
- 2 diced leeks
- 1 celery root, chopped
- 3 large portobello mushroom caps, diced
- 1 tbsp of fresh tarragon, chopped (divided)
- 1 tbsp of fresh chives, chopped (divided)
- 1 cup of panko bread crumbs
- 1 cup of Gruyere cheese, grated
- 1 ½ tbsp of all-purpose flour
- ¾ cup of heavy cream
- 2 tbsp of water (or more if needed)
Step 1
To kick things off, preheat your oven to a toasty 400 degrees F (200 degrees C). In a pan over medium heat, let the butter dance and sizzle. Toss in the leeks and celery root, letting them mingle and cook for a delightful 10 minutes. As the aromas start to dance, add in those mushroom pieces, a sprinkle of tarragon, and a dash of chives. Let them all simmer and meld together until the mushrooms release their flavorful juices, which takes about 6 more minutes.
Step 2
While that's all coming together beautifully, grab a mixing bowl and mix those breadcrumbs with the luscious Gruyere cheese. Back to the pan, add a sprinkle of flour to the mushroom medley. Pour in the cream slowly, stirring until it transforms into a harmonious hue, which should take around 3 minutes. Toss in half of the breadcrumb-cheese concoction, stir until the cheese begins its melty magic, approximately 2 minutes. Switch off the heat, scoop this heavenly mix into a baking dish, and sprinkle the remainder of the tarragon, chives, and breadcrumb mix on top. A drizzle of water to keep things moist is a secret touch.
Step 3
Pop this creation into the waiting oven and let it bake until the cheese is bubbly and irresistible, which is usually about 10 minutes of tantalizing wait. With a trusty spatula, scoop out portions of this cheesy delight and serve piping hot, enjoying the savory symphony of flavors at once.
Extra Tips & Suggestions
- 1. Start by prepping your Portobello mushrooms by gently cleaning them with a damp cloth to remove any dirt or debris, then pat them dry.
- 2. When storing Portobello mushrooms, it's best to place them in a paper bag or a perforated plastic bag to allow for airflow. This will help prevent them from becoming slimy.






