Grilled Steak Kebabs

Name: Grilled Steak Kebabs
Ingredients: 2 lb top sirloin steak, sirloin tips, or tri tip; 1/2 cup olive oil; 1/3 cup balsamic vinegar; 1/4 cup Worcestershire sauce; 3 garlic cloves; 2 tbsp brown sugar; 1 tbsp dried parsley; 1 tsp dried oregano; 1/2 tsp dried thyme; 1 tsp onion powder; 1 tsp crushed red pepper flakes (more if you want spicier); 1 tsp salt (or to taste); 1 red onion; 1-2 bell peppers; 8 oz baby bella mushrooms; 2 tbsp olive oil; 1 tsp garlic powder; 1/2 tsp cracked black pepper; 1 tsp salt