This recipe is adapted from these Maple Bars, which recipe I got years ago from Our Best Bites, who got the recipe from this Top Pot Doughnuts book, which I have just added to my Amazon wishlist. It looks so good!
Nutella Donuts - https://finalstockalert.com/nutella-filled-donut-recipe/%3C/em%3E%3C/p%3E%3C/div%3E%3C/div%3E%3Cscript%3Ewindow.wprm_recipes = {"recipe-29412":{"type":"food","name":"Nutella Donuts","slug":"wprm-nutella-donuts","image_url":"https:\/\/thefoodcharlatan.com\/wp-content\/uploads\/2018\/06\/Nutella-Filled-Donut-Recipe-5-e1528987072182.jpg","rating":{"count":5,"total":25,"average":5,"type":{"comment":0,"no_comment":0,"user":5},"user":0},"ingredients":[{"uid":0,"amount":"3","unit":"tablespoons","name":"active dry yeast","notes":"","unit_id":4727,"id":1627,"type":"ingredient","unit_systems":{"unit-system-1":{"amount":"3","unit":"tablespoons","unitParsed":"tablespoons"}}},{"uid":2,"amount":"1","unit":"cup","name":"warm water","notes":"105 degrees F","unit_id":4728,"id":1586,"type":"ingredient","unit_systems":{"unit-system-1":{"amount":"1","unit":"cup","unitParsed":"cup"}}},{"uid":4,"amount":"1","unit":"tablespoon","name":"sugar","notes":"to proof yeast","unit_id":4725,"id":753,"type":"ingredient","unit_systems":{"unit-system-1":{"amount":"1","unit":"tablespoon","unitParsed":"tablespoon"}}},{"uid":6,"amount":"2","unit":"teaspoons","name":"salt","notes":"","unit_id":4730,"id":754,"type":"ingredient","unit_systems":{"unit-system-1":{"amount":"2","unit":"teaspoons","unitParsed":"teaspoons"}}},{"uid":8,"amount":"1\/2","unit":"teaspoon","name":"baking powder","notes":"","unit_id":4724,"id":822,"type":"ingredient","unit_systems":{"unit-system-1":{"amount":"1\/2","unit":"teaspoon","unitParsed":"teaspoon"}}},{"uid":10,"amount":"1\/2","unit":"cup","name":"sugar","notes":"add to dough","unit_id":4728,"id":753,"type":"ingredient","unit_systems":{"unit-system-1":{"amount":"1\/2","unit":"cup","unitParsed":"cup"}}},{"uid":12,"amount":"4","unit":"cups","name":"bread flour","notes":"","unit_id":4726,"id":2303,"type":"ingredient","unit_systems":{"unit-system-1":{"amount":"4","unit":"cups","unitParsed":"cups"}}},{"uid":14,"amount":"1\/4","unit":"cup","name":"shortening","notes":"I like butter flavored Crisco","unit_id":4728,"id":1144,"type":"ingredient","unit_systems":{"unit-system-1":{"amount":"1\/4","unit":"cup","unitParsed":"cup"}}},{"uid":16,"amount":"3","unit":"","name":"egg yolks","notes":"","id":756,"type":"ingredient","unit_systems":{"unit-system-1":{"amount":"3","unit":"","unitParsed":""}}},{"uid":18,"amount":"1\/2","unit":"teaspoon","name":"vanilla","notes":"","unit_id":4724,"id":821,"type":"ingredient","unit_systems":{"unit-system-1":{"amount":"1\/2","unit":"teaspoon","unitParsed":"teaspoon"}}},{"uid":20,"amount":"","unit":"","name":"peanut oil or light olive oil","notes":"for frying","id":3967,"type":"ingredient","unit_systems":{"unit-system-1":{"amount":"","unit":"","unitParsed":""}}},{"uid":22,"amount":"1 & 1\/2","unit":"cups","name":"sugar","notes":"for rolling donuts","unit_id":4726,"id":753,"type":"ingredient","unit_systems":{"unit-system-1":{"amount":"1 & 1\/2","unit":"cups","unitParsed":"cups"}}},{"uid":24,"amount":"","unit":"","name":"LOTS OF NUTELLA","notes":"","id":3968,"type":"ingredient","unit_systems":{"unit-system-1":{"amount":"","unit":"","unitParsed":""}}}],"originalServings":"25","originalServingsParsed":25,"currentServings":"25","currentServingsParsed":25,"currentServingsFormatted":"25","currentServingsMultiplier":1,"originalSystem":1,"currentSystem":1,"unitSystems":[1],"originalAdvancedServings":{"shape":"round","unit":"inch","diameter":0,"width":0,"length":0,"height":0},"currentAdvancedServings":{"shape":"round","unit":"inch","diameter":0,"width":0,"length":0,"height":0}}}