Preheat the oven to 375°F (190°C).
Grease a 9x13 inch baking dish with olive oil.
In a skillet over medium heat, cook the ground beef with garlic, salt, and pepper until browned. Drain the excess fat.
Stir in the marinara sauce, basil, and oregano, and simmer for 5 minutes until the flavors meld. Set aside.
In a bowl, mix together the ricotta cheese, egg, and half of the Parmesan cheese.
Lay the zucchini sheets on paper towels to absorb excess moisture.
Layer the bottom of the prepared baking dish with zucchini sheets, slightly overlapping.
Spread half of the meat sauce over the zucchini sheets.
Dollop spoonfuls of the ricotta mixture on top of the meat sauce and gently spread.
Sprinkle a third of the mozzarella cheese over the ricotta mixture.
Add another layer of zucchini sheets, followed by the remaining meat sauce, another third of mozzarella, and the rest of the ricotta mixture.
Finish with a final layer of zucchini sheets, the remaining mozzarella, and Parmesan cheese.
Cover with foil and bake for 30 minutes.
Remove the foil and bake for an additional 15 minutes, or until the cheese is golden and bubbly.
Let the lasagna rest for 10 minutes before slicing and serving.