1/4cupmelted butterI have also tried using melted coconut oil and it works great
Instructions
Preheat oven to 375. I use a Pyrex loaf pan with coconut oil on the sides and a rectangle piece of parchment paper along the bottom of the pan-the loaf pops right out every time once cool.
I dump everything in one large bowl and stir until well combined.
Bake for 15 minutes, then place a loose piece of aluminum foil across the top and bake for another 55 minutes.