1. Lightly brush rounds with olive oil and toast in 350 degree oven until crisp.
2. In a small bowl, mash the avocados and season with salt and pepper.
3. In another small bowl, gently stir the crabmeat with lemon juice and season with salt.
4. Spread the mashed avocado on the toasts, top with the crab mixture and sliced jalapeno.