Make the pico de gallo: In a small bowl, combine tomato, red onion, jalapeño (if using), cilantro, lime juice, oil and salt. Stir well and let sit to meld the flavors.
Toast the bread: Toast the bread slices in a toaster or under a broiler until golden and crisp, about 2–3 minutes.
Cook the eggs: In a nonstick skillet, melt the butter over medium heat. Crack in the eggs, season with salt and black pepper, and cook sunny-side up or to desired doneness, about 2–3 minutes.
Assemble the toast: Spread mashed avocado evenly over each toasted slice. Spoon pico de gallo on top of each.
Serve: Plate the avocado toast with two eggs on the side. Add a portion of fresh fruit to each plate and pour cold orange juice into glasses. Enjoy!