Place the baguette slices on a baking sheet. Brush with olive oil, sprinkle with salt. Bake in an oven preheated to 220 ° C until golden brown, for about 7 minutes. Remove slices of bread from the oven and cool slightly.
Stir asparagus with olive oil, salt, and pepper, and place on a baking sheet. Bake in an oven preheated to 230 ° C until crisp for about 7 minutes.
Spread butter on the slices of bread. Top with ham and asparagus.