Chicken ‘n Veggie Souvlaki

Name: Chicken ‘n Veggie Souvlaki
Ingredients: 1/4 cup finely chopped fresh oregano leaves (about 1/2 cup leaves); 2 tablespoons minced fresh dill (about 1/4 cup dill sprigs); 1 tablespoon finely chopped green onions (about 1 green onion); 2 teaspoons lemon zest; 3 tablespoons fresh lemon juice (2 to 3 lemons); 2 cloves garlic (crushed (or more if you like)); 1/4 teaspoon red pepper flakes (or to taste); 1/4 teaspoon salt; 1 tablespoon olive oil; 1 pound boneless skinless chicken breast (cut into 1-inch chunks); 1 medium onion (cut into chunks and separated into pieces); 2 medium yellow squash (cut into 1-inch slices); 1 pint cherry tomatoes; Metal or wooden skewers