In the bowl of a stand mixer fitted with the paddle attachment, combine flour and yeast.
In a medium saucepan, heat milk, sour cream, butter, sugar, and salt over medium heat. Cook, stirring occasionally, until a candy thermometer registers 120°.
With mixer on low speed, gradually add milk mixture to flour mixture, beating until combined. Add egg, beating until a dough forms.
Switch to the dough hook attachment. Beat at medium speed until dough is smooth and elastic and pulls away from sides of bowl, about 5 minutes. Spray a large bowl with cooking spray. Place dough in bowl, turning to grease top. Cover and let rise in a warm, draft-free place (75°) until doubled in size, about 1½ hours.
Recipe by Southern Cast Iron at https://southerncastiron.com/honey-nut-sweet-rolls/