Place 1 ¼ cup milk, 3 eggs, 3 tablespoons melted butter, 2 teaspoons sugar, a pinch of salt, ½ teaspoon vanilla extract, and 1 cup all-purpose flour in a blender or food processor. Blend until smooth, 5-10 seconds.
Refrigerate the batter for 30 minutes or up to 2 days.
Finely chop the chocolate and place it in a heat-proof bowl.
Place 1/2 cup of heavy whipping cream in a saucepan and heat until hot.
Pour the hot cream over the chocolate.
Allow the cream chocolate mixture to sit for 1-2 minutes, then gently stir a few times until the chocolate has all melted. Allow the ganache to cool.
Heat a small non-stick skillet on medium-high heat and coat lightly with butter.
Using a ¼ cup measuring cup, put a scant amount of batter in the center of the pan. Swirl the batter around, coating the bottom of the pan, and cook for 20-30 seconds.
Flip the crepe and cook for an additional 20-30 seconds.
Recoat the frying pan with butter and repeat with the remaining batter until all batter is used.
Slice the bananas into wheels.
Place a crepe on a plate, and spread ganache on one half.
Add sliced bananas and salted peanuts.
Fold the unfilled half of the crepe over the filled half. Decorate with more ganache and bananas.
Serve immediately.