Start by preparing the scallops. Pat them dry with paper towels to remove any excess moisture. Season both sides of the scallops with salt and pepper.
Heat a large skillet over medium-high heat. Add olive oil and butter to the skillet, allowing the butter to melt and start bubbling.
Carefully place the scallops into the skillet, making sure they are not overcrowded. Cook the scallops for about 2-3 minutes on each side until they develop a golden brown crust. Avoid moving them around too much to achieve a good sear. Remove the scallops from the skillet and set them aside on a plate.
Return the scallops to the skillet, nestling them among the fennel. Add the lemon zest and give everything a gentle toss to combine. Cook for another 1-2 minutes to warm the scallops through.
Taste the dish and adjust the seasoning with salt and pepper if needed.
Serve the pan-seared scallops with fennel on a plate, garnished with fresh parsley. Accompany the dish with lemon wedges for squeezing over the scallops, if desired.
Enjoy your delicious pan-seared scallops with fennel!