Preheat the oven to 400 degrees. Place the baguette slices on a parchment lined sheet tray. Brush with olive oil and season with salt and pepper.
While the baguette bakes, heat the olive oil in a medium saucepan over medium heat.
Add the shallot and the garlic and cook until softened and golden, 2-3 minutes. Add the milk and heat until hot, but not boiling.
Toss the cheeses with the cornstarch and add to the milk mixture. Reduce the heat to low and cook until the cheese is completely melted, stirring constantly.