Place the chicken tenderloins in the slow cooker in a single layer.
In a medium bowl, whisk together the chicken broth, honey, soy sauce, Dijon mustard, minced garlic, smoked paprika, black pepper, and salt until well combined.
Pour the sauce mixture evenly over the chicken tenderloins in the slow cooker.
Scatter the sliced onion over the top of the chicken and sauce.
Drizzle the olive oil over the ingredients in the slow cooker.
Cover and cook on low for 4 hours, or until the chicken tenderloins are cooked through and tender.
Carefully remove the chicken tenderloins from the slow cooker and place on a serving platter.
Stir the sauce and onions in the slow cooker to combine, then spoon the sauce over the chicken tenderloins before serving.