Arrange baguette slices in a single layer on a baking sheet. Drizzle slices with olive oil and bake for 8-10 minutes, until golden brown. Set aside to cool completely.
When baguette slices are cool, spread on a thick layer of brie followed by a generous dollop of cherry preserves - 2 or 3 teaspoons. Top each with one or two baby arugula leaves. Serve.