In a medium pot, melt butter over medium heat. Add mushrooms and sauté until soft and tender. Season with salt and pepper. Add garlic and sauté for 1 minute more or until fragrant.

Stir in oats, chicken broth, and chili flakes. Bring to a boil and cook for 5 minutes, stirring occasionally.

Stir in spinach and cook until wilted. Serve in bowls topped with goat cheese and more chili flakes, if desired.