In a shallow bowl, combine almond flour, salt and pepper; dredge turkey slices in mixture until well coated on all sides.
Heat the olive oil in a large skillet over medium-high heat until hot. Add turkey slices; cook for 2 to 4 minutes per side (depending on thickness). Remove from skillet and set aside.
In the same skillet, melt the butter. Add garlic, onion and mushrooms; cook and stir until tender.
Stir in remaining ingredients (broth through thyme); bring to a simmer.
Serve sauce over turkey.