In a glass bowl or measuring cup, melt the unsweetened chocolate, 1 cup chocolate chips, and the selected fat in the microwave. Start with about 90 seconds and then stir continuously until all pieces are melted and smooth. Be careful not to overheat the mixture, as the chocolate will seize and turn clumpy. Alternately, melt over low heat on the stove.
Beat the eggs and sugar until thick, creamy, and pale yellow in color: about a minute or so.
Add in the vanilla and melted chocolate mixture.
Whisk the dry ingredients together, mix in.
Add in remaining chocolate chips if desired.
Batter should be very thick, especially as the melted chocolate cools! The dough should plop and have no movement when placed on the cookie sheet.
Form cookies with about a tablespoon of dough, press into desired shape. They will not change shape in the oven!!
Bake in a preheated oven for about 8-10 minutes until slightly firm. The cookies will firm up when they cool, and are much better if they are NOT over-cooked!