01 - Preheat oven to 400°F. Line a baking sheet with foil and lightly grease.
02 - Slice chicken breasts in half horizontally, then cut into 8 equal pieces.
03 - Whisk together maple syrup, Dijon mustard, soy sauce, olive oil, salt, and pepper.
04 - Toss chicken pieces in marinade. Let sit for 10–15 minutes.
05 - Lay bacon slices on the prepared baking sheet. Bake for 12–15 minutes, until crisp. Drain on paper towels.
06 - Heat grill pan or skillet over medium-high heat. Cook chicken 3–4 minutes per side, until cooked through and caramelized.
07 - Brush cut sides of slider buns with melted butter. Toast in a skillet or on grill until golden.
08 - Layer arugula, chicken, bacon, cheese, and onion (if using) on buns.
09 - Secure with cocktail picks and serve warm.