Step 1: Prepare and Season the Potatoes
Cut potatoes into 1 to 1.5-inch cubes
Place potato cubes in a large bowl
Add ¼ cup vegetable oil and spices
Toss until all pieces are well coated
Spread potatoes evenly on a large baking sheet
Leave space in the middle for onions
Step 2: Add the Onions
Cut large onion into thick wedges
Keep some layers together so they don't fall apart
Arrange onion wedges in the center of the tray
Place them in the middle of the potatoes
Step 3: Make the Chicken Sauce
In a medium bowl, combine ½ cup oil and ½ cup water
Add 2 tablespoons yogurt and 1 teaspoon tomato paste
Add spices generously (salt, pepper, paprika, garlic powder, cumin)
Whisk everything together until smooth and well combined
The sauce should have a thin marinade consistency
Step 4: Prepare and Skewer the Chicken
Cut chicken breast into uniform 1-inch cubes
If using wooden skewers, soak in water for 15 minutes first
Thread chicken cubes onto skewers
Leave small gaps between pieces for even cooking
Generously brush or pour sauce over all chicken pieces
Make sure each kebab is well coated
Optional: Marinate for 30 minutes to 2 hours for extra flavor
Step 5: Arrange Everything on the Tray
Place sauced chicken skewers on top of the onions in the center
Skewers should rest on the onions for elevation
Scatter cherry tomatoes around the tray
Tuck bell pepper chunks between potatoes and near chicken
Ensure colorful, even arrangement
Step 6: Cover and Bake
Preheat oven to 400°F (200°C)
Cover entire baking sheet tightly with parchment paper
Create a sealed environment to trap steam and moisture
Place covered tray in preheated oven
Bake for 40 minutes without opening
Do not peek during this time
Step 7: Uncover and Brown
Carefully remove tray from oven after 40 minutes
Use caution with hot, steamy parchment paper
Remove and discard parchment paper
Return uncovered tray to oven
Bake for additional 10-15 minutes
Continue until chicken is golden-brown on top
Watch closely to prevent burning
Step 8: Rest and Serve
Remove from oven when chicken reaches 165°F internal temperature
Let rest for 5 minutes before serving
Chicken should be white throughout with no pink
Potatoes should be crispy outside, tender inside
Vegetables should be perfectly roasted
Serve kebabs on skewers with roasted vegetables