
Rinse salmon and pat dry with paper towels.
In a small bowl, mix together salt, pepper, garlic powder and lemon zest.
Rub flesh side of salmon filets with mixture of spices.
In a cast iron skillet, over medium-high heat, add olive oil to the pan.
Once pan is hot, add seasoned salmon fillets - skin side down. Cook for 3-4 minutes until the skin becomes crispy and golden brown.
Using a fish spatula, flip the salmon filets and cook for an additional 2-3 minutes.
After flipping salmon, add butter and minced garlic to pan. Spoon garlic butter over the salmon fillets.
Check the salmon with a thermometer; it should be 125º for medium rare.
Remove salmon from pan and garnish with lemon wedge.