Step 1

Combine the brown sugar, chili powder, garlic powder, dried thyme, salt and pepper in a small bowl. Whisk or stir to combine.

Step 2

Place the pork tenderloins on a plate or cutting board and pat dry with paper towels. Trim off any silver skin. Sprinkle the seasonings over all sides of the pork and gently rub into the meat.

Step 3

Heat 2 teaspoons of the olive oil in a large skillet over medium heat. Add the onion to the pan and cook until softened and lightly browned, about 5 minutes. Transfer onion to the slow cooker.

Step 4

Add the remaining 2 teaspoons of oil to the pan. Add the seasoned pork tenderloins to the pan. Brown on all sides, about 2 minutes per side. Then transfer the pork to the slow cooker on top of the onions.

Step 5

Cover and cook on low for 2-3 hours, or until pork registers at least 145° F in the center when measured with an instant read thermometer.

Step 6

Let pork rest for 10 minutes before slicing and serving.