Combine warm milk, yeast, and sugar and allow to activate for 5-10 min

Add 3 tbs butter, egg, flour, salt, garlic powder, and rosemary to yeast mixture using a rubber spatula. Mix until dough forms a soft cohesive ball

Knead on a lightly-floured surface for 5 min until dough bounces back with a poke (or complete the window pane test)

Rest dough in covered and greased bowl for 1-1.5 hours

Mix 5 tbs butter, rosemary, parsley, garlic, and salt to create filling

Punch down dough and divide into 12 equal portions on lightly-floured surface. Flatten each ball to 4 in diameters and spread filling. Line into buttered bread pan

Cover bread pan and allow to rise in warm environment until puffy, approximately 45 min

Bake at 350° for 50 min on lower third rack

Cool for 10 min in pan and add melted butter and flaky salt if desired