Preheat your oven to 425°F.
Slice the red bell pepper, zucchini, and red onion into bite-sized pieces.
Toss the vegetables with olive oil, salt, and pepper, and spread them evenly on a baking sheet.
Roast the vegetables in the oven for 15-20 minutes until they are tender and slightly charred.
While the vegetables are roasting, heat a skillet over medium-high heat and add the lean ground beef. Season with salt and pepper.
Cook the ground beef, breaking it up with a spatula, until it is browned and cooked through, about 6-8 minutes.
Once the vegetables are roasted, add them to the skillet with the beef and mix well.
In a separate small pan, cook the egg to your preference (fried or poached works well) and place on top of the skillet mixture.
Serve the beef and roasted vegetable skillet immediately, enjoying the blend of savory flavors and textures.