Prepare the Chicken: Cut chicken breasts into 2-3 inch square pieces.
In a medium bowl, whisk together olive oil, smoked paprika, garlic powder, onion powder, dried thyme, salt, and pepper.
Add chicken to the bowl and coat well with the spice mixture.
Cover and marinate in the refrigerator for at least 30 minutes (or overnight for maximum flavor).
Heat a large skillet or grill pan over medium-high heat; add olive oil if needed.
Cook chicken in a single layer for 4-5 minutes per side until cooked through and internal temperature reaches 165°F (74°C).
Remove chicken and set aside.
Make the Maple Bacon Glaze: In a small saucepan, combine maple syrup, apple cider vinegar, Dijon mustard, Worcestershire sauce, and red pepper flakes.
Simmer over medium heat for 5-7 minutes until slightly thickened, stirring occasionally.
Remove from heat and set aside.
Cook bacon until crispy; drain grease and crumble or cut into slider-sized pieces.
Lightly toast slider buns if desired.
Spread a thin layer of maple bacon glaze on the bottom bun.
Place cooked chicken on the glaze.
Drizzle more maple bacon glaze over the chicken.
Add a slice of brie cheese if using.
Sprinkle crumbled bacon over the cheese or chicken.
Top with arugula or baby spinach if desired.
Place the top bun on the slider.
Repeat with remaining ingredients.
Serve immediately.