Scoop avocado flesh into a small bowl. Mash with a fork until you reach your desired consistency.
Drizzle with olive oil. Add tomato, red onion, jalapeno, garlic, lime juice, cilantro, and salt. Stir to combine.
Cover the guacamole with saran wrap by pressing the plastic directly against the guacamole, all the way to the edges. You want to keep the air away from the avocado so that it does not turn brown.
Refrigerate for at least two hours for the flavors to meld and for the dip to chill. Adjust seasoning as needed.