Preheat the oven to 375°F.
Place the peppers cut side up in a large pan with half cup of water in the bottom. Sprinkle lightly with kosher salt bake in the oven for 10 minutes until softened.
In a large skillet, heat 2 tablespoons of olive oil over medium heat. Sauté the onions and celery with a pinch of kosher salt until softened. Then, add the sliced cremini mushrooms and cook for an additional 10 minutes until softened and slightly browned. Transfer the mixture to a bowl.
In that same skillet where all the magic’s happening, melt down that butter over a nice medium heat. Then, toss in the flour and give it a whirl for about 3-4 minutes, stirring like a champ until it’s got a lovely light brown hue. Now, here comes the fun part: slowly pour in the chicken broth (or white wine) and coconut milk, stirring like crazy to keep those lumps at bay. Sprinkle in the crushed thyme, mushroom powder, salt, and pepper for some extra flavor. Let it all come to a boil, then dial down the heat and let it simmer until it’s nice and thick.
Throw in that mushroom mix, shredded chicken, and cooked rice, giving it all a good stir until it’s warmed through and through. If things start gettin’ too thick, just splash in a bit more milk.
Load up the peppers with that delicious chicken mixture and sprinkle on some shredded cheese for good measure.
Cover up that baking dish with some foil and slide it into the oven. Let it bake for about 20-30 minutes until it’s all bubbly and that cheese is perfectly melted.