Cajun Parmesan Salmon

In a large skillet over medium-high heat, heat oil. Season salmon with 1 teaspoon Cajun seasoning and pepper, then add to the skillet skin-side up. Cook salmon until deeply golden, about 6 minutes, then flip and cook 2 minutes more. Transfer to a plate. Add butter and garlic to skillet. When butter has melted, stir in broth, lemon juice, honey, remaining teaspoon Cajun seasoning, parsley, and Parmesan. Bring mixture to a simmer. Reduce heat to medium and add salmon back to skillet. Simmer until sauce has reduced and salmon is cooked through, 3 to 4 minutes more. Add lemon slices to skillet and serve.