01 - Preheat oven to 400°F. Line a baking sheet with aluminum foil and lightly grease the surface.
02 - Slice each chicken breast in half horizontally, then cut into 8 equal-sized portions so each slider gets one piece.
03 - In a mixing bowl, whisk together the maple syrup, Dijon mustard, soy sauce, olive oil, salt, and pepper until well combined.
04 - Add the chicken pieces to the marinade and toss to coat evenly. Let rest for 10 to 15 minutes at room temperature.
05 - Arrange the bacon slices on the prepared baking sheet and bake for 12 to 15 minutes until crisp. Transfer to paper towels to drain.
06 - Heat a grill pan or large skillet over medium-high heat. Cook the marinated chicken pieces for 3 to 4 minutes per side until fully cooked through and nicely caramelized.
07 - Brush the cut sides of each slider bun with melted butter. Toast on a skillet or grill pan until golden brown.
08 - Layer arugula, a piece of chicken, a slice of bacon, a cheese slice, and red onion if desired on the bottom half of each bun. Cap with the top bun.
09 - Secure each slider with a cocktail pick and serve warm.