Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper.
Clean and slice the cremini mushrooms, and finely mince the garlic cloves.
In a medium bowl, toss the sliced mushrooms with melted ghee, minced garlic, smoked paprika, sea salt, and black pepper until well coated.
Spread the mushrooms in a single layer on the prepared baking sheet and roast for 15-20 minutes until they are tender and caramelized.
While the mushrooms roast, season the chicken breast with a pinch of salt and pepper, then sear in a hot non-stick skillet for 6-7 minutes per side until fully cooked.
Remove the chicken from the skillet and deglaze the pan with balsamic vinegar, stirring in the fresh thyme leaves to create a light glaze.
Place the baby spinach on a plate, top with the seared chicken breast, and finish by spooning the smoky roasted garlic mushrooms and pan glaze over the top.