Begin by cutting your white fish fillets into bite-sized pieces, about 1 to 2 inches each. In a bowl, mix flour, salt, and black pepper, then dredge the fish pieces in this mixture, ensuring an even coating for that perfect crispy texture. Set them aside on a plate while you prepare the cooking apparatus.

Heat a large skillet over medium heat and add a generous mix of butter and olive oil, around 2 tablespoons of each. Once the butter has melted and the mixture shimmers, carefully add the coated fish bites. Sauté the fish for 3-4 minutes on each side until they turn beautifully golden and crispy, ensuring not to overcrowd the pan.

After the fish is golden and perfectly cooked, remove the bites from the skillet and place them on a paper towel-lined plate to drain excess oil. In the same skillet, add minced garlic, stirring it into the remaining flavorful oil. Sauté the garlic for about 30 seconds, watching for it to turn fragrant and lightly golden.

Once the garlic is aromatic, stir in the fresh lemon juice and zest, creating a delightful sauce. Return the crispy fish bites to the skillet, tossing them gently in the lemon butter mixture for 1-2 minutes to warm through and absorb the zesty flavor.

Prepare the creamy garlic aioli. In a bowl, combine mayonnaise, additional minced garlic, a squeeze of lemon juice, and a pinch of salt. Whisk the mixture until it's smooth and creamy, adjusting garlic and lemon to taste.

Carefully plate your crispy lemon butter fish bites, and garnish them with freshly chopped parsley. Serve alongside the creamy garlic aioli.