Heat olive oil in a large cast-iron skillet over medium-low heat. Gently cook fish on both sides until golden brown. Remove the cod fillets from the skillet and set aside to a plate.
In the same skillet over medium heat, add minced garlic then deglaze with vegetable broth (or wine). Bring it to a simmer. Add butter, lemon juice, hot sauce, and parsley. Give a quick stir to combine the lemon garlic butter sauce.
Pour sauce over the cod. Garnish with more parsley, crushed chili pepper, and lemon slices.