Heat the butter and olive oil in a large frying pan over medium heat.
Add in the garlic and onions and sauté for 10 minutes or until softened.
Add the wine, mussels, thyme and seasoning to the pan and stir everything together. Cover the pan and allow the mussels to cook for 4 – 5 minutes.
Toss the spinach into the pan and mix it in thoroughly. Cover the pan to let the spinach wilt for a couple of minutes.
Plate the mussels in the pan with spinach and drizzle the white wine sauce on top.
Serving Suggestions: Serve with white rice, crusty bread, crispy oven-baked fries, or a tomato salad and enjoy with your loved ones.