Preheat the oven to 325ºF (162°C)
Sauté the chicken livers and garlic in the olive oil until the liver is firm and no longer pink. Pulse the cooked liver in a food processor. Slowly add the drippings and process the mixture until it forms a paste.
Slowly add the water and continue processing till smooth and creamy. Measure the rice flour, rolled oats, and baking powder into a mixing bowl. Add the grated cheese and whisk until combined. Make a well in the flour, and add the liver mixture all at once.
Mix on medium speed using a paddle attachment until dough forms and all the ingredients are combined. Turn the dough out onto a slightly floured surface and form into a log, about 2 inches in diameter. Wrap in plastic wrap and chill for 1 hour.
When ready to bake, slice the biscuits 1 ⁄ 8 -inch thick and place them on a parchment-lined cookie sheet. Bake 12– 15 minutes till they are dry and firm to the touch. Turn the oven off and leave the biscuits in another 20– 30 minutes.
Remove them from the oven, cool them on a baking rack, and store them in a cookie tin.