Preheat the oven to 400°F (200°C) and slice the eggplant into thin rounds. Brush with olive oil and roast for 15 minutes until tender.
Sauté garlic in a skillet with 1 tablespoon olive oil. Add ground beef, cook until browned, and stir in bouillon, basil, and keto marinara sauce. Simmer for 5 minutes.
Mix ricotta cheese, egg, and 1 cup of mozzarella in a bowl until well combined.
Layer in a baking dish: roasted eggplant slices, beef sauce, and ricotta mixture. Repeat the layers until ingredients are used up.
Top with the remaining mozzarella and Parmesan cheese.
Bake uncovered for 25-30 minutes until the cheese is golden and bubbly.
Rest for 10 minutes before slicing to help the layers set.
Serve warm and enjoy!