In a medium size bowl, mix together flour, baking powder, baking soda, salt and cinnamon.
Put the mixer bowl on a scale and add the 196 grams (7 oz or half a can) of condensed milk along with the softened butter, brown sugar and vanilla.
Beat with an electric mixer for 2 minutes or until lightened.
Add the flour mixture and stir until blended, then stir in the mini chocolate chips.
Divide the dough into 4 pieces. On a large sheet of plastic wrap, shape one piece into a rope about 14-15 inches long. Roll in plastic and set on a flat tray or something you can fit into the freezer. Repeat with remaining dough. Keep logs frozen while you preheat the oven.
Preheat oven to 325F Line a large baking sheet with parchment paper.
Working one rope at a time, slice into ½ inch rounds. You should get around 36 dough pieces per rope. Arrange on sheet spacing only about ¾ of an inch apart at most and sprinkle with sea salt if desired.
Bake for about 15 to 18 minutes.If your cookies are coming out too dark at 325, you can bake them at 300F for longer time. The bake time might involve a little trial and error. I accidentally over baked some at 375 and still liked them even though they were obviously overdone.
Transfer the minis to a wire rack to cool and crisp.