Breakfast sandwiches are delicious, and while crusty bread like a baguette isn't usually the first type you'd choose for one, if you do, press it, don't toast it. You'll thank us later. Image from Joanna Alderson.
Bread with a thick crust is already tough and crisp enough, and toasting it will just make it harden and dry out even more. Unlike softer breads, where toasting them warms them up and gives you some texture, a crusty, firmer bread already gives you the texture you're looking for. You don't even need a panini machine, just use two skillets to add weight.
3 Essential Tips for a Better Breakfast Sandwich [The Kitchn]