In a medium bowl, combine the first six ingredients. Season with salt and pepper to taste. Cover bowl and let sit in the refrigerator for at least 2 hours.
Preheat oven to 375ºF. Cut baguette crosswise into 1/4” thick pieces. Lay out on a foil-lined cookie sheet. Drizzle olive oil on the bread and sprinkle with salt and pepper. Bake until golden brown, about 8 - 10 minutes.
Spread guacamole on each piece of toasted bread. Top with a healthy spoonful of the tomato mix. Top with a sprinkle of Cotija cheese.