Stir together ingredients for seasoning in a small bowl. Cut cod into smaller pieces, if desired. Season all sides of the cod with the seasoning.
Heat 2 Tbsp butter in a large skillet over medium-high heat. Once butter melts, add cod to skillet. Cook 2 minutes.
Turn heat down to medium. Turn cod over, top with remaining butter and cook another 3-4 minutes.
Butter will completely melt and the fish will cook. (Don’t overcook the cod, it will become mushy and completely fall apart.)
Drizzle cod with fresh lemon juice. Top with fresh herbs, if desired. Serve immediately.