Preheat your oven to 375°F (190°C).
In a bowl, mix together spinach, feta cheese, cream cheese, garlic, salt, and pepper.
Lay the salmon fillets skin-side down on a cutting board.
Spread the spinach and feta mixture evenly over the top of each fillet.
Carefully roll each salmon fillet tightly from one end to the other.
Secure the rolls with kitchen twine or toothpicks.
In a skillet, heat olive oil over medium heat.
Sear the salmon pinwheels for 3-4 minutes on each side until golden brown.
Transfer the pinwheels to a baking dish and bake for 15 minutes.
Garnish with fresh dill before serving.