Pre-heat oven to 350 degrees.
In mixer or large both combine all wet ingredients, including: bananas, eggs, peanut butter, and vanilla.
Add all the remaining dry ingredients into the wet ingredients, and stir until well combined.
Using a large scoop, 1/4 C measuring cup, or a large spoon, place batter in well formed mounds onto parchment lined or cooking sprayed cookie sheet. NOTE* These cookies do not really spread. How they appear on the cookie sheet before they go into the oven is how they will look when they are finished cooking. I like to use a scoop and then gently press down tops so I have nice even looking cookies.
Bake at 350 until cookies are set and slightly firm to the touch. About 12-15 minutes.