In a small blender or food processor, pulse the strawberries, balsamic vinegar, and honey until completely smooth.
Transfer the strawberry mixture to a small saucepan and simmer over medium-low heat for 5-7 minutes until the liquid reduces and thickens into a glaze.
Cut the chicken breast, red bell pepper, and red onion into uniform 1-inch cubes.
In a mixing bowl, toss the chicken cubes with olive oil, sea salt, black pepper, and garlic powder until evenly coated.
Thread the chicken, peppers, and onions onto skewers, alternating pieces for even cooking.
Preheat a grill pan or outdoor grill to medium-high heat and lightly grease if necessary.
Grill the skewers for 10-12 minutes, turning every few minutes, and brush generously with the strawberry glaze during the final 4 minutes of cooking.
Remove from heat once the chicken is cooked through and serve over a bed of warm cooked quinoa.