DIY Homemade No Bake Healthy Cat Treats! After much research online and not wanting to turn on the oven, I came up with these: 1/4 cup oats, 1/3 cup peas (canned or thawed/frozen), 1/2 cup canned tuna (not drained), 1 tablespoons parmesan cheese. Puree in food processor, add olive oil as necessary to make a dough. Shape into 1/2" diameter small balls and keep refrigerated. Makes about 2 dozen and my cats LOVE them!