In a large cup, mix the first three ingredients. Let stand for 10 minutes.
In the bowl of the stand mixer, add the dry ingredients. Starting with the paddle attachment, mix on low just to combine ingredients.
When ready, mix in the activated yeast and lightly beaten eggs. Mix for one minute at medium speed.
Mix in the vanilla, butter and half of the milk. Continue mixing for 2-3 minutes, then switch to the hook attachment. You will knead/mix the dough for about 20 minutes at medium speed. After the first 10 minutes, I scrape down the sides and let the mixer rest for one minute. If the dough seems dry, you can add a little more milk. Mix for another 10 minutes or until the dough begins to pull away from the sides of the bowl. It will feel tacky.
Add some oil to your hands and transfer dough to a greased bowl. Cover with towel and let the dough proof for 1 1/2 hours to 2 hours in a warm spot. It should grow more than double in size.
With more oil on your hands, transfer dough to a lightly flat surface. Divide into 8 equal dough balls. Roll into balls and transfer to a greased baking sheet or lined with parchment paper.
Using a plastic lined tortilla press or a flat bottomed plate, press candy topping and place on each concha. Gently press down and cup topping with the palm of your hand to stick to dough ball. Score each concha using a small sharp knife. Cover with towel and let conchas proof for another hour.
When ready, preheat oven to 350 degrees F. Bake conchas for 14-17 minutes or until bottoms and edges are golden brown. Internal temperature of bread should read 190 degrees.