In a bowl, whisk together olive oil, soy sauce, black pepper, garlic powder, and oregano. Place the meat cubes in a resealable plastic bag or a shallow dish, pour the marinade over top and let marinate in the refrigerator for at least 30 minutes.
1 tbsp olive oil, 1 tbsp soy sauce, ½ tsp pepper, 1 tsp garlic powder, 1 tsp oregano, 1 lbs steak
Preheat your grill to medium-high heat and begin to assemble kabob skewers by threading the marinated meat, mushrooms, green bell pepper chunks, and red onion wedges onto the skewers, alternating between the ingredients.
1 green bell pepper, 1 small red onion, 1.5 cup mushroom, wooden skewers
Place the assembled kebabs on the preheated grill. Cook for about 10-15 minutes, turning occasionally, or until the meat is cooked through and the vegetables are nicely charred.
While the kebabs are grilling, prepare the chimichurri sauce. In a bowl, combine parsley, garlic, oregano, red pepper flakes, red wine vinegar, olive oil, salt, and pepper. Mix well and set aside.
1 cup parsley, 3 cloves garlic, 1 teaspoon oregano, 1/2 teaspoon red chili flakes, 1/4 cup red wine vinegar, 1/4 cup olive oil, 1/8 tsp salt, 1/4 tsp pepper
Once the kebabs are cooked, remove them from the grill. Serve the meat and vegetable kebabs with a side of chimichurri sauce for dipping.