I used rolled oats to make these. Grind them to make smooth powder and then use it. Grind flax seeds too beforehand.

In a mixing bowl mix all the ingredients well. Use water to make a dough. It should not be soft, consistency should be like poori/puri dough.

Now using this dough make small 1.5″ size small balls. This much dough will yield to 30 mathris around. Take 1-2 black pepper seed on the flat surface, crush it with rolling pin and now place one small ball on top of it. Roll it over to make a 2″ 2.5″ diameter circle. With the help of fork put holes in both sides. Poking holes prevent them puffing up while deep frying.

Do the same procedure with the rest of the balls.

Heat oil in a kadhai/pan and put these rolled circles into it. Keep turning them to avoid burning. The flame should be between high and medium, change it from time to time. Fry till they get a golden colour.

Oats flaxseeds mathris are ready to serve. Let them cool completely and store in airtight jar. It is my teatime snack, I love to have it with green tea. With mix pickle, it tastes heavenly.

Before storing make sure that they are completely cool down. Else they will become soggy.
Flex seeds are optional if not available. But it is very good in nutritional value.
You can bake oats flax seeds mathri too. WIll post that method soon.