Using a sharp serrated knife, cut 20 slices from the baguette (on an angle, ¼-inch thick). Save the remaining bread for another use.
Place the slices on a large baking sheet in a single layer. Brush both sides with olive oil, then sprinkle one side lightly with salt.
Bake for 5 to 10 minutes, or until crisp throughout and lightly golden (no need to flip). Set aside.
Let crostini cool slightly, then rub with cut side of garlic clove. Set aside.
Prepare Topping:
Combine tomatoes, olive oil, balsamic vinegar, salt, crushed red pepper flakes, and garlic. Mix well, then season to taste with additional salt, if desired.
Stir in basil.
Serve:
Serve crostini topped with tomato mixture. Enjoy!
Notes
You should be able to get about 40 slices from a ½-pound (255 grams) baguette, so you will have leftover bread. If you want use all the bread, you can double the topping ingredients, make a different topping (like these Mushroom Crostini or this Whipped Goat Cheese Crostini), or you can store the leftover crostini for later.To avoid soggy toasts, assemble this appetizer right before serving. If it will be sitting out for a while before eating, serve the topping separately from the toasts, then let your guests assemble the crostini themselves.Make sure to check out the info before this recipe card for more tips, step-by-step photos, variations, and more!