Place the pork tenderloin in the slow cooker.
In a small bowl, whisk together the maple syrup and Dijon mustard until well combined.
Pour the maple-Dijon mixture over the pork tenderloin, ensuring it is evenly coated.
Cover the slow cooker and cook on low for 6-8 hours or until the pork is tender and fully cooked.
Once cooked, remove the pork from the slow cooker and let it rest for a few minutes before slicing.
Serve the sliced pork with the remaining sauce from the slow cooker drizzled on top.

Variations & Tips
For a bit of spice, add a teaspoon of crushed red pepper flakes to the maple-Dijon mixture. If you prefer a smokier flavor, try adding a tablespoon of smoked paprika. You can also substitute chicken breasts for the pork tenderloin if you prefer poultry. For a more robust flavor, marinate the pork in the maple-Dijon mixture for a few hours before cooking.