Combine 4 tablespoons basil pesto, 1/2 cup unsalted butter and 2 minced garlic cloves in a medium bowl.
Place 4 skinless salmon fillets into an oven-safe skillet. Season the both sides with salt and pepper. Squeeze lemon juice on top.
Using a spoon or a small ice cream scoop, evenly portion the pesto butter and place it on top of each fillet.
Bake in the preheated oven for 10-15 minutes, or until the salmon is cooked through, adjusting the time based on the thickness of the fillets and your desired level of doneness.
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Notes
Leftovers can be stored in an airtight container in the refrigerator for up to 2 days. For best results, reheat gently in a low oven (300°F/150°C) or an air fryer to maintain moisture. Freezing is not recommended, as the pesto butter may separate.