This is really good - either thrown on the grill on skewers, or cooked in the oven under the broiler.
2-3 boneless, skinless chicken breasts, cut into chunks (at least 1 1/2 inches)
onions in large slices
mushrooms, halved if large
In large bowl or ziploc, mix:
2-4 tbsp olive oil
2-3 cloves garlic, minced (or more, if you really like garlic)
1 tsp oregano
1 tsp basil
salt and pepper to taste
Add chicken and veggies to bag/bowl, toss to coat. Marinate at least 30 minutes, turning occasionally. Either cook on grill, on skewers, or on a large pan, spread out in one layer - cook under the broiler, turning after 3-4 minutes, and cook until done.