In a large skillet over medium heat, cook the bacon until it is just browned, about 5 minutes. Transfer the bacon to paper towels to drain excess fat. Crumble or cut into small pieces.
In a large saucepan combine the drained tomatoes, sugar, apple, onion, vinegar, salt, pepper, and bacon. Bring to a boil over medium heat and cook, stirring often, for 12 minutes or until apples are tender and most of the liquid is reduced.
Remove pan from heat; let sit for 5 minutes.
Arrange baguette slices on a serving platter, top with a dollop of warm jam, the feta, and chives. Makes 30 crostini.