In a mixer bowl, dump flour, baking powder, garlic powder, and salt and mix well.Add in chopped jalapeños and the chunks of Cheddar cheese.Cut cold butter into cubes and add them to the flour mixture. Use the mixer on low or a pastry cutter to mix until the butter is mixed in a the size of peas.Turn the mixer on low and slowly pour in the milk or buttermilk.Mix JUST until the dough is mostly pulled together and then immediately stop. There will still be some crumbs at the bottom of the bowl.Pour the whole mess onto a cutting board and gently pull the pile together , and flatten it a bit. Flip it over one time to collect all of the crumbs. Gently press it together until it is about an inch thick.Use a skinny glass or a biscuit cuter to cut out circles.Gently place them on a cookie sheet and bake in a preheated 450 degree oven for about 12 minutes or until just golden on top.