Add cheddar, flour, and butter to a food processor. Pulse several times until you get coarse crumbs.
Add in the yogurt and spice blend and pulse for about a minute. The dough will be crumbly, but hold together when compressed
Lay out plastic wrap. Separate the dough into 2 portions, and wrap each of them in airtight plastic wrap. Refrigerate for at least 30 minutes.
Remove dough from fridge and allow to come to a malleable temperature. Use flour to dust both sides of the dough to make sure it doesn't stick. Roll into a thin sheet, roughly ¼" thick.
If you want to use cute cookie cutters, cut out desired shapes and lay them on a sheet pan lined with parchment paper. Alternatively, for less work/time you can cut into grid patterns and use a chopstick or other utensil to poke a hole in the middle of each cracker.
Arrange the sheet pan as necessary. Crackers can be fairly close together, ½" - 1" apart as they should not spread. They may puff up vertically a little, but they shouldn't puff out.
Bake 15 - 20 minutes in the oven or until lightly brown and puffy.