Gather a baking tray, skewers, a small bowl, and a brush. Preheat your oven to 200°C (390°F) and line the tray with foil or parchment for easy cleanup.
In the small bowl, whisk together olive oil, lemon juice, smoked paprika, garlic powder, salt, and black pepper until well combined. This makes a vibrant marinade filled with smoky and tangy notes.
Cut the chicken breasts into roughly 2-inch cubes, ensuring even-sized pieces for uniform cooking. Slice the bell pepper into similar-sized chunks for color and sweetness.
Place the chicken pieces into the marinade, tossing gently to coat each piece thoroughly. Cover and refrigerate for at least 30 minutes, up to 2 hours, allowing the flavors to penetrate and tenderize the meat.
Thread the marinated chicken and bell pepper chunks onto skewers, alternating for a colorful presentation. Leave small gaps between pieces for even heat distribution during baking.
Arrange the skewers on the prepared baking tray and brush lightly with additional olive oil for extra browning. Place the tray in the oven and bake for 20-25 minutes, turning halfway through, until the chicken is golden and juices run clear.
Check that the chicken reaches an internal temperature of 75°C (165°F) and that the edges are crispy and browned. If needed, bake for a few more minutes, watching carefully to prevent over-browning.
Remove the skewers from the oven and let them rest for 5 minutes. During this time, brush with a little more marinade or squeeze fresh lemon over for an extra burst of flavor.
Carefully slide the skewers off the sticks onto a serving platter. Serve immediately while hot, perhaps alongside rice or a fresh salad for a complete meal.