Heat the butter and olive oil in a saucepan over medium heat. Add the onion and saute until translucent, and then stir in the garlic, sauteing until fragrant (about 30 seconds). Add in the rice, stirring frequently for 2 - 3 minutes. Pour in the broth and bring to a boil. Once it boils, reduce heat to low and simmer until tender, refer to the package for cooking time. Once tender, taste and adjust seasonings with salt and pepper.
Prep Chicken: In a bowl, mix the oil, lemon juice, garlic powder, oregano, and chicken. Season with salt and pepper and toss until fully combined.
Heat a grill or griddle pan over medium heat.
Thread the chicken, zucchini, and green and red bell pepper onto the wooden skewers.
Grill on all sides, basting with any remaining marinade throughout cooking. Cook chicken to an internal temperature of 160°F (71°C) using a thermometer.
Grill the corn on all sides until nicely charred and tender. Once tender, lather with butter and lightly season with salt.
Make the Salad: Mix all ingredients for the dressing. Set aside. Mix all ingredients for the salad. Place into serving bowls, and toss with the dressing.
Add the lemon slices to sparkling water. Serve over ice if desired.
Serve kabobs over rice pilaf with greek house salad, grilled corn, and sparkling water