Preheat oven to 425 degrees F.
Place the salmon in a large sheet of aluminum foil on a rimmed baking sheet. Pat the salmon dry with a sheet of paper towel.
Combine the olive oil, lemon juice, minced garlic, parsley flakes, sea salt, black pepper, and red pepper flakes in a small bowl. Drizzle this over the salmon, trying to cover all parts of the salmon equally. Place the lemon slices on top of the salmon.
Cinch together the sides of the foil to close the salmon into the foil packet.
Bake for 10 minutes and then open the foil packet. Broil on high for 2 to 3 minutes, making sure it doesn’t burn.
Remove the salmon from the oven and serve immediately. Top with optional fresh dill.