If using fresh blueberries, wash and dry the blueberries and coat them in coconut flour. If you are using frozen blueberries, pat dry them with a paper towel and coat them with 1 tablespoon coconut flour.
Combine the dry ingredients in a bowl; add the poppy seeds if using.
Whisk the wet ingredients in another bowl.
Add the dry ingredients to the wet ingredient bowl and combine with a spatula without overmixing. You will get a solid but light-textured batter/dough.
Add the blueberries coated in coconut flour.
Spoon the batter into the paper cups and sprinkle some poppy seeds on top. Bake for 30-40 minutes, until they don't feel soft to touch anymore. If using more blueberries and especially if using frozen blueberries, the baking time will be about 40 minutes.