Preheat oven to 350 degrees. Place celery leaves in a single layer on a baking sheet and place in oven. Bake until crispy, but not browned, about 5-7 minutes. Remove from heat and cool completely. Once cool, crumble the leaves, discarding any leaves that are not crispy. Combine leaves with an equal amount of salt in a small jar. Shake to distribute celery evenly throughout. Voila, you have delicious homemade celery salt!