Smooth Vs Crunchy: Which Is Best For Peanut Butter Balls? - Tasting Table
Briefly

"Whether you call them peanut butter buckeyes, balls, or truffles, one thing is certain: They are delicious. Anything with peanut butter and chocolate is, but that's just us."
"While it's totally possible, recipe developer Christina Musgrave recommends going with creamy peanut butter for a smooth, more satisfying texture. The crunchy kind disturbs the overall texture too much."
"To achieve the ultimate smoothness, we recommend using a standard variety, like one from our ranked list of grocery store peanut butters. Our favorite is Jif Creamy."
"If you must have a little crunch, try chopping up peanuts into super tiny pieces and adding them to the creamy peanut butter. This will give you just the right amount of crunch without being too overwhelming."
Read at Tasting Table
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