1. Preheat your oven to 400°F and line a baking sheet with parchment paper.
2. Toss the sliced cremini mushrooms with olive oil, sea salt, and black pepper on the prepared sheet.
3. Roast the mushrooms for 15 minutes until they are golden brown and tender.
4. While mushrooms roast, season the chicken breast with a pinch of salt and pepper.
5. Heat the ghee in a large skillet over medium-high heat and sear the chicken for 5-6 minutes per side until fully cooked.
6. Remove the chicken from the skillet and let it rest on a plate.
7. In the same skillet, add the minced garlic and sauté for 1 minute until fragrant.
8. Reduce the heat to low, then stir in the roasted mushrooms, Greek yogurt, and fresh thyme to create a thick, velvety sauce.
9. Plate the fresh baby spinach and top with the chicken and a generous spoonful of the creamy garlic mushroom sauce.