Begin by finely chopping one small onion and a few spring onions. In a skillet, melt 2 tablespoons of butter over medium heat. Sauté the onions for about 3-4 minutes until they soften and become translucent. Remove from heat and transfer the cooked onions to a mixing bowl. Add in crab meat and season with salt and black pepper to taste, stirring thoroughly to combine the flavors.

In a saucepan, melt 3 tablespoons of butter over medium heat. Once melted, whisk in 3 tablespoons of all-purpose flour and cook for about 1 minute. Gradually pour in 1 cup of whole milk, continuing to whisk until the mixture thickens and becomes smooth, which takes around 3-5 minutes. Once ready, remove from heat and allow the béchamel to cool slightly before adding it to the crab mixture.

Pour the prepared béchamel into the bowl containing the sautéed onions and crab meat. Gently fold the béchamel into the mixture until fully incorporated. This creamy crab filling should have a luscious consistency without being overly runny. Let the mixture cool for about 15-20 minutes in the refrigerator to make shaping the croquettes easier while enhancing the flavors.

Once the filling has cooled, scoop out portions and shape them into small balls or patties, roughly the size of a golf ball. Prepare a breading station by placing all-purpose flour, a beaten egg, and panko breadcrumbs into three separate shallow dishes. Dust each croquette in flour, dip it into the egg, and then coat it evenly with panko breadcrumbs for that perfect crispy exterior.

In a large frying pan, heat enough neutral oil to cover the bottom, over medium-high heat until it reaches 350°F (175°C). Carefully place the breaded croquettes in the hot oil, ensuring they are not overcrowded. Fry for approximately 3-4 minutes on each side or until golden brown and crisp. Use a slotted spoon to remove the croquettes from the oil and place them onto paper towels to drain excess oil.

Once drained, transfer the crispy Creamy Crab Croquettes to a serving platter. Garnish them with freshly chopped parsley for a pop of color and freshness. Consider serving them with spicy mayo or a squeeze of lemon for added flavor. These croquettes are best enjoyed warm, allowing the creamy crab filling to shine alongside the crunchy exterior.