Pssst… you know what the secret is to making the best blackberry muffins?
Muffins that are rich, tender, and loaded with blackberries?
No, it’s not the butter (though butter makes everything better IMHO).
If your guess is it has something to do with the type of berries, you’re close. Wild blackberries do make the best pies, muffins, and cakes. But you can only get those a couple months of the year.