Place a large skillet or wok over medium-high heat and add 1 tablespoon of olive oil.
Add the ground beef to the skillet and cook until fully browned, using a spatula to break the meat into small crumbles.
Transfer the cooked beef to a bowl and drain any excess fat from the pan.
Add the remaining 1 tablespoon of olive oil to the skillet.
Incorporate the red onion, zucchini, and bell pepper into the skillet; sauté for 5 to 6 minutes until vegetables are tender-crisp.
Add the minced garlic, cherry tomatoes, oregano, basil, salt, and pepper; cook for an additional 2 minutes until the tomatoes begin to soften.
Return the browned beef to the skillet and toss all ingredients to combine and heat through.
Remove the skillet from heat and stir in the lemon juice and fresh parsley.
Garnish with crumbled feta cheese and serve immediately.