Steak Skewers with Avocado Sauce

For the Veggies

• 1 onion cut into large pieces
• 1 red pepper cut into large pieces
• 1 yellow summer squash cut into large pieces
• 1 zucchini cut into large pieces
• 8 mushrooms cut in half

For the Steak

• 5 tablespoons extra virgin olive oil
• 1 tablespoon granulated garlic
• 1 tablespoon granulated onion
• 1 1/2 teaspoons dried oregano
• 1 teaspoon ground black pepper
• 1/2 teaspoon kosher salt
• 1 tablespoon red pepper flakes optional
• 2 tablespoons Jalapeño crushed or diced (optional)
• 3 pounds beef top sirloin steak 1"-thick

Avocado Sauce

• 1 medium-ripe avocado seeded, peeled and coarsely chopped
• 1/2 cup seedless English cucumber, coarsely chopped
• 1/4 cup cilantro lightly packed
• 1/4 cup sour cream
• 2 tablespoons lime juice
• 1 teaspoon kosher salt
• 1 teaspoon ground cumin