What do I use to attach the fondant to cookies? Do I spread on icing like a cake? Which icing works best for it. RI doesn't taste good, is there an alternative?
A tasty, easy way is to make some sieved jam glaze.
1 C jam of choice, 1/2 C water. Cook to a simmer, then strain. Allow to cool, then brush a thin layer onto a cooled cookie before applying fondant. If you keep refrigerated in an airtight container, it can last several months.
Or you can use clear vanilla or a little water or thinned light corn syrup.
I use corn syrup with a tiny bit of water. If it's a background color then I just cover warm cookies with fondant and it sticks without any syrup. Then I attach other decorations.
I cover the cookies when they're just out of the oven. The heat will melt the back of the fondant just enough to bond it to the cookie.
I just use a squirt bottle of corn syrup. Dab all over and lay on the fondant
Thinned royal icing.