To begin, I combine the softened cream cheese, shredded cheddar, and finely chopped cooked shrimp in a mixing bowl. I prefer using shrimp that’s been sautéed or steamed, then cooled and chopped for an even texture throughout the filling.
Next, I add in the Cajun seasoning, garlic powder, smoked paprika, and salt. I like to give everything a good mix with a spatula or wooden spoon until the ingredients are fully combined and the filling looks rich and evenly speckled with spice. At this point, the mixture should be thick and spreadable—perfect for stuffing into jalapeños.
I start by preheating the oven to 375°F (190°C) and lining a baking sheet with parchment paper to prevent sticking. Then, I slice the jalapeños in half lengthwise and carefully remove the seeds and membranes using a small spoon or the edge of a knife. If you're sensitive to spice, wearing gloves is a good idea during this step.
Using a spoon or small spatula, I fill each jalapeño half with a generous scoop of the shrimp and cheese mixture, smoothing the top to ensure even cooking. If I’ve prepared the optional breadcrumb topping, I sprinkle it over each one now, pressing gently to help it stick.
I arrange the filled jalapeños on the lined baking sheet and pop them into the preheated oven. They bake for 15–20 minutes, or until the filling is hot and bubbly, and the tops are just turning golden. If you're using breadcrumbs, they should be crisp and lightly browned by this point.