Preheat oven to 400F.
Heat olive oil (or butter) on low-medium heat in a small pan. Add garlic and saute on low for about 1 minute. Remove from heat and add lemon juice, parsley, oregano, and salt + pepper to taste.
Arrange fish and veggies in a single layer on a sheet pan. Evenly pour the garlic spice mixture onto fish and veggies. Bake for 12-15 minutes or until golden.
To meal prep: Cook 1 cup of brown rice according to package instructions. Divide rice into 4 meal prep containers. Place 1 tilapia fillet in each container along with a few carrots, asparagus, and broccoli. Cover and place in the fridge for up to 4 days. To reheat, microwave on high for 1-2 minutes or until steaming.