In a small mixing bowl, whisk the egg with the melted butter/oil and lemon juice.
Combine the wets with the dries and stir until dough forms.
Place the dough between two sheets of parchment paper and roll out to about 1/8 inch thickness.
With a sharp knife or pizza cutter, cut dough into desired cracker size (I use a ruler with a pizza slicer to get them straight and even) and sprinkle the top with more sea salt.
Slide the bottom piece of parchment and crackers onto a cookie sheet.
Bake at 350 for 12-15 minutes until golden.
The outer crackers will brown the fastest, remove those and continue to cook the remaining crackers.