Soak wooden skewers in water for 10 minutes to prevent burning during the grilling process.
In a medium mixing bowl, whisk together the extra virgin olive oil, chili flakes, garlic powder, smoked paprika, sea salt, and black pepper to create a spicy marinade.
Cut the chicken breast, red bell pepper, and red onion into uniform 1-inch cubes.
Add the chicken and vegetables to the marinade bowl and toss thoroughly until every piece is well-coated.
Thread the chicken, pepper, and onion pieces onto the skewers, alternating them for even cooking and flavor distribution.
Preheat a grill pan or outdoor grill over medium-high heat and lightly grease if necessary.
Place the skewers on the grill and cook for 10 to 12 minutes, turning every few minutes, until the chicken is cooked through and the vegetables have a light char.
Remove from heat, garnish with freshly chopped cilantro, and serve warm as a high-protein small plate.