Preheat your broiler on high. Position an oven rack below the broiler, but make sure you leave enough room to fit your baking sheet.
Slice the French baguette on a bias (diagonal) with a ¼-inch thickness. Slicing the bread on a bias not only looks prettier, it also gives your crostini more surface area (needed to hold more cheese, dip, etc.).
Lay the baguette slices flat on a baking sheet leaving approximately a ½-inch of space in between each slice. Using a brush, spread extra virgin olive oil evenly over the top side of each slice. You want each piece to be coated in olive oil, but not swimming in it.
Sprinkle each slice with some flaky sea salt and freshly ground black pepper.
Transfer the baking sheet underneath the broiler and cook until golden brown and crispy. Cooking time can vary, so make sure you keep a constant eye on the crostini. I’ve ruined many batches of crostini by leaving them unattended!
Crostini can be served warm or at room temperature.