01 - Preheat the oven to 400°F. Line a rimmed baking sheet with aluminum foil and lightly grease the surface.
02 - Slice each chicken breast in half horizontally, then cut into 4 equal portions to yield 8 slider-sized pieces total.
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 glaze and toss to coat evenly. Allow to rest for 10 to 15 minutes at room temperature.
05 - Arrange the bacon slices in a single layer on the prepared baking sheet. Bake for 12 to 15 minutes until golden and crisp. Transfer to paper towels to drain.
06 - Heat a grill pan or cast-iron skillet over medium-high heat. Sear the marinated chicken pieces for 3 to 4 minutes per side until deeply caramelized and cooked through to an internal temperature of 165°F.
07 - Brush the cut sides of each slider bun with melted butter. Place face-down on a hot skillet and toast until golden brown, about 1 to 2 minutes.
08 - Layer arugula on each bottom bun, followed by a chicken piece, a slice of bacon, a cheese slice, and red onion if desired. Cap with the top bun.
09 - Secure each slider with a cocktail pick and serve immediately while warm.