Melt 2 tbsp of salted butter in a small dish and set aside.
Mash bananas in large mixing bowl until mostly mashed. Some remaining small clumps are okay.
Add eggs and vanilla extract. Mix bananas, eggs and vanilla together until combined.
In a medium mixing bowl, whisk together all-purpose flour, baking soda, baking powder, sea salt and flaxseed.
Add dry ingredients to wet ingredients and combine.
Stir in melted butter. Be sure it is only warm and not too hot. Combine thoroughly.
Heat a griddle or skillet over medium-low heat.
Use remaining 2 tbsp of butter to grease the skillet or griddle as needed.
Scoop out 1/4 cup of batter for each pancake. Flip after 3-4 minutes and underside is firm and a nice golden-brown color. Cook another 3-4 minutes on the remaining side.
Serve warm and enjoy!