Pat each salmon fillet dry using a paper towel, then place them skin-side down on a plate.
Brush the fillets with olive oil on both sides so they don’t stick when you cook them.
Combine garlic powder, smoked paprika, lemon pepper, salt, and black pepper in a small bowl, then sprinkle this mixture evenly over your fillets.
Heat a cast iron skillet over medium-high heat, then add the butter and minced garlic, letting them melt together for about 30 seconds until aromatic.
Lay the seasoned salmon fillets in the pan, skin-side down, and cook for about 4 minutes per side or until the internal temperature hits 145°F.
During the last minute, add lemon slices on top of each fillet and spoon some of the garlicky butter over each one.
Transfer your cooked salmon to plates and sprinkle a little chopped parsley over the top.