Cut the chicken breasts into thick cubes. Remember that the meat will shrink slightly during cooking, so cut slightly larger pieces.
Drizzle the chicken with olive oil and season with salt, pepper, granulated garlic, marjoram, and sweet paprika.
Refrigerate the chicken to marinate. For best flavour, marinate overnight, but even 1 hour before grilling works well.
Prepare the vegetables:
Slice the courgette
Cut bell peppers into pieces
Quarter the red onions and separate the layers
Keep cherry tomatoes whole
Assemble the skewers by alternating chicken pieces with vegetables. Arrange them in a colorful and tasty order.
Preheat the grill to 200°C. Turn the knobs down to medium for indirect grilling.
Grill the skewers indirectly on a stand or top shelf with the lid closed for 10–12 minutes (12–15 minutes if using the top shelf). Rotate the skewers every few minutes to cook evenly.
Serve immediately, straight from the grill.