Season salmon with salt and pepper on both side.
In a frying pan, heat up olive oil. Add salmon fillet to the pan, skin side down until the skin becomes crispy.
Add butter to the pan, sauté garlic add flour and mix. Pour milk and keep whisk it until it turns creamy then add spinach. Season it with garlic powder, salt, pepper, stock cube. Let cook for approx 2-3 minutes.