Heat olive oil in a large skillet over medium-high heat. Once shimmering, add chicken pieces and cook until golden brown on all sides, about 8-10 minutes. Season with salt and pepper, then transfer to a plate.

In the same skillet, melt butter and add diced onion. Sauté until softened and fragrant, roughly 3-4 minutes, stirring occasionally. This builds a flavorful base for your fall dinner.

Add minced garlic and sliced mushrooms to the skillet, cooking until the mushrooms release their moisture and begin browning, approximately 5-6 minutes. Stir frequently to ensure even cooking throughout this cozy fall mushroom skillet dinner.

Pour in chicken broth and scrape the bottom of the pan to release any browned bits. Return the chicken to the skillet and bring the mixture to a gentle simmer for 5 minutes. This infuses the chicken with all the savory flavors.

Reduce heat to medium-low and stir in heavy cream, fresh thyme, and smoked paprika. Simmer for 3-4 minutes until the sauce thickens slightly and coats the chicken beautifully. Taste and adjust seasonings as needed.

Add fresh spinach and grated parmesan cheese, stirring until the spinach wilts completely. The cheese creates a creamy, luxurious finish that elevates this weeknight skillet dinner to restaurant quality.