Preheat oven to 350ºF(180ºC). Line a large baking sheet with parchment paper. Whisk the flour, baking powder, baking soda, salt, sugar and cinnamon in a large bowl.
Use a pastry cutter or fork or your fingertips to quickly cut the butter into the flour mixture until you get pea size pieces.
Add cheddar cheese and just give a quick stir to combine with the flour mixture. Add the buttermilk and pumpkin purée and use a fork to mix until incorporated and the dough just comes together.
Pour the mix onto a lightly floured piece of large parchment paper, gently press the dough and then pat it with your hands trying to shape it into about 1/2 inch (1cm) thick rectangle. Using the side of the paper if needed fold the dough into thirds like a business letter, using the long sides of the rectangle. Repeat this step, pat it down again into a 1/2 inch (1cm) rectangle and again fold it into thirds like a letter.
Finally sprinkle some flour on the dough and gently pat it down to about o ¾ inch (2cm) thickness.
Use a floured 2 1/2 inch (6 cm) round cookie cutter to cut discs from dough. Don't twist the cutter, use a straight up and straight down motion. Reshape and cut leftover dough.
Place the biscuits, 1 inch apart, on the prepared baking sheet.
Brush the tops of the biscuits with beaten egg and sprinkle with some sesame and flex seeds and salt flakes.
Bake for 20-25 minutes or until crisp and golden.
Meanwhile, whisk the softened butter, maple syrup and a touch of salt until fluffy.
Serve biscuits warm and spread with maple flavored butter.