Preheat the oven to 350 degrees F and place the rack in the middle of the oven.
In a medium bowl, gently toss the nectarines, bell pepper, onions, 2 teaspoons of the olive oil, the lime juice and chile. Set aside.
Spread out the baguette slices on a baking sheet. Lightly brush the bread with the remaining 1 tablespoon plus 1 teaspoon olive oil. Bake the baguette slices until the bread is lightly toasted, 3 to 5 minutes (watch closely so they don't overbrown or burn).
Remove the bread from the oven and top each slice with a spoonful of the nectarine mixture. Sprinkle the cheese on top. Place the baking sheet back into the oven and heat the bruschetta for an additional 3 to 5 minutes, just until the bruschetta are heated through. Serve immediately.