Preheat the grill to medium-high heat, about 400–425°F. Oil the grates.
Pat the chicken tenders dry with paper towels. Add them to a large bowl with olive oil, garlic powder, paprika, and black pepper. Toss until evenly coated.
Make the honey mustard butter. In a small saucepan over medium-low heat, melt the Challenge Salted Butter. Whisk in the honey, Dijon mustard, and yellow mustard until smooth and glossy.
Transfer some of the honey mustard butter to a separate small bowl for brushing the chicken on the grill. Reserve the remaining sauce for serving.
Grill the chicken tenders for 3–4 minutes on the first side. Flip and grill for another 3–4 minutes, until almost cooked through.
During the last 1–2 minutes of grilling, brush the chicken tenders with the honey mustard butter and turn once or twice, just until glossy and lightly caramelized.
Transfer the chicken tenders to a platter and drizzle or brush with the reserved honey mustard butter. Serve warm.
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