Preheat your oven to 425°F for roasting the vegetables.
Slice the red bell pepper, zucchini, yellow squash, and red onion into bite-sized pieces. Toss them in a bowl with olive oil, dried rosemary, dried thyme, salt, and black pepper.
Spread the vegetables on a baking sheet in a single layer and roast for about 15-20 minutes, stirring halfway, until they are tender and slightly caramelized.
Meanwhile, pat the top sirloin steak dry with a paper towel. Season both sides generously with salt, black pepper, and a light sprinkle of dried rosemary and thyme to create a herb crust.
Heat a skillet over medium-high heat. Once hot, add the steak and sear for about 3-4 minutes on each side, or until a crust forms and the steak reaches your desired doneness. Adjust cooking time as needed.
Allow the steak to rest for 5 minutes before slicing against the grain.
Plate the sliced steak with the roasted rainbow vegetables on the side. Enjoy your balanced and flavorful meal!