Preheat oven to 350F/180C. Line baking sheet/s with parchment paper or lightly grease it with non-stick cooking spray. I usually rub the butter wrapper on the baking sheet/s.
In a small cup, whisk together the Ener-G egg replacer and water; set aside.
Add the vegan butter substitute and sugars (white and brown) in a large bowl and beat until light and creamy.
Add the Ener-G egg replacer mix, corn syrup, and vanilla extract to the creamed butter-sugar mix, and beat well.
To this creamed wet mix, add the dry ingredients listed under Part 2. Mix well with a wooden spoon.
Mix in the chocolate chunks. The cookie dough is ready now.
Scoop a tablespoon of dough for each cookie onto the baking sheet and slightly flatten it. Bake the cookies for 15-16 minutes or until golden brown. (See My Notes)
Remove the cookie sheet from the oven, place it on a wire cooling rack, and cool completely before storing it in an air-tight container.
Repeat the same process for the rest of the dough.
Notes
If you don't want to make it vegan, use butter and regular chocolate chunks/chips. This will reduce the cost of baking the cookies. Do not use shortening because it will make the cookies crispy rather than soft and chewy, which I believe is the original texture of the Insomnia chocolate chunk cookies.
Always test-bake cookies before trying a huge batch. Use a tablespoon to scoop the dough and place it on the cookie sheet. As always, I test-baked about 5 cookies to see how well they spread or don't spread so that I don't mess up a huge batch of cookies. I normally try two things. Few cookies, I just drop the dough and, for the remaining, flatten it. The baking test showed that the cookies didn't spread much as it is, so flattening the dough was absolutely necessary. This may change with the type of fat you use, the consistency of how well it is creamed with the sugar, and the rest of the ingredients.
Although I did not try freezing the cookie dough for this recipe, I'm sure it would work perfectly. Scoop the dough onto the cookie sheet, lightly flatten it (if the test bake proved that the cookies do not spread without flattening), cover the cookie sheet with plastic wrap, and place it in the freezer. After a couple of hours, transfer the frozen cookie dough into a freezer bag and store it for 3-4 months. If you are in the mood for freshly baked warm cookies, simply remove the cookie dough from the freezer, place it on the baking sheet, and bake it, maybe for a couple of minutes extra. Thawing is not necessary.
Taste & Texture
These cookies are delicious and warm from the oven. The soft and chewy texture, along with the melting chocolate chunks, it's pure bliss.
Once it cools, the edges are crispy and soft in the center. After a day or two, it sort of gets a bit on the hard side. It's nothing to complain about. The kids loved it. But you can warm it up in the microwave oven for a few seconds to have softer cookies.
Next time I will have to try to make these Insomnia cookies using butter. I'm sure it will have a different flavor.