Preheat your oven to 400°F (200°C) and line your baking tray with parchment paper or a silicone mat.

In a medium mixing bowl, combine the drained shrimp, softened cream cheese, shredded cheddar cheese, Old Bay seasoning, dried minced onion, and kosher salt. Mix until well blended and creamy.

Slice the jalapenos in half lengthwise and remove the seeds. Fill each jalapeno half with the shrimp filling and arrange on the baking tray.

Bake stuffed jalapenos in the preheated oven for about 20 minutes or until tender and lightly browned.

Remove from the oven, let cool for a few minutes, and serve warm.