Baking eggshells helps to dry them out fully, especially the membrane inside the egg. Drying out the membrane, allows you to crush up the eggs more easily.
You can throw the baked eggshells in a blender to grind them into a fine dust super quickly.I then store them in a quart size mason jar until I am ready to use them.
Add 1 heaping TBSN of the eggshells along with 1 TBSN of Epsom salts, into the hole I have dug in the pot, or in the ground. Then plant your tomato or pepper plant.