The Double Tree cookies are actually made by the Christie Cookie Company and are certified kosher dairy. However, if they're baked in a non-kosher kitchen, they're no longer kosher. Some Double Tree hotels have Glatt Kosher kitchens so if the cookies are baked off in one of those kitchens, no problem, they're kosher.
Kosher cookies are cookies that have been made with kosher ingredients. For example, no gelatin from animal sources (so marshmallows must be kosher, which are made with fish or seaweed-based gelatin.)
There are kosher Milano cookies available, you would have to check the packaging for reliable certification.
No, they are not.
The DoubleTree cookie is made by The Christie Cookie Company in Nashville, Tennessee. You can buy the cookie DOUGH at the link posted below. You can order the cookies directly online but you have to call to buy the frozen cookie dough.
There are kosher cookies. To be kosher, cookies (or any processed food) need a stamp from a rabbi stating that no non-kosher ingredients were used (like pig fat) and that the kitchen and utensils were kosher (for example if you used utensils for meat products, they would not be permitted for use with milk products).
The Grand Doubletree was created in 1986.
The Grand Doubletree Shops was created in 1986.
The DoubleTree Suites are managed by Hilton. You can book a stay at the DoubleTree Suites online from websites such as Trip Advisor, Booking and Expedia.
Doubletree Guest Suite Resort was created in 1987.
Gluten per se is not non-kosher. The only question is where the gluten came from. Unprocessed wheat kernels (for example) are not non-kosher; but processed foods containing gluten, such as cookies, crackers, pastas, breads etc., need a certification of kosher-supervision if they are to be eaten by Jews who keep kosher. This need stems not from the wheat or the gluten, but from other ingredients which may have either kosher or non-kosher sources.
Doubletree Alana is a hotel not an object. One can purchase a stay at the hotel for however long they wish and one can book at the Doubletree Hilton website or by phoning them.
Of course not. Making a kosher cookie simply requires that you follow the requirements for kosher cooking, such as preparing the ingredients in a dairy kitchen and using only kosher-dairy ingredients.