Dissolve yeast in warm milk in a large bowl; let stand 5 minutes. Lightly spoon flours into dry measuring cups, and level with a knife. Stir in 3 cups bread flour, semolina, oil, and salt to yeast mixture to form a stiff dough. Turn dough out onto a lightly floured surface. Knead dough until smooth and elastic (about 10 minutes); add enough of remaining bread flour, one tablespoon at a time, to prevent dough from sticking.
Place dough in a large bowl coated with cooking spray, turning to coat top. Cover and let rise in a warm place (85°), free from drafts, 45 minutes or until doubled in bulk. Punch dough down; roll into a 15 x 10-inch rectangle on a lightly floured surface. Place on a large baking sheet coated with cooking spray. Place 2 ounces cheese down the center of the short length of dough; top with 2 ounces prosciutto and 2 tablespoons chives. Fold one short end of dough over filling. Place 2 ounces cheese, 2 ounces prosciutto, and 2 tablespoons chives on top of fold. Fold remaining short end over filling, pressing firmly to eliminate air pockets; pinch seam and ends to seal. Place on a baking sheet coated with cooking spray. Cover focaccia, and let rise 45 minutes or until doubled in bulk.
Preheat oven to 375°.
Uncover dough. Bake at 375° for 20 minutes. Remove from baking sheet; cool on wire rack. Cut loaf crosswise into 10 slices.
I started making this many years ago when I saw it in Cooking Light and I've been making it at least once a year since. It's a really good stuffed bread roll. I do add in an extra layer of Salami in mine (because I'm Italian and love it), so it ends up being more like a self made sandwich. But, be forewarned- if you try that, you may need to bake the bread a bit longer as sometimes I end up with the middle of the dough roll being left a bit undercooked. Also, if you don't have semolina flour, you can try cake flour (which is extra fine) or I've done just normal all-purpose without any issue. But you still need to have the bread flour. When I've made it, the loaf is quite huge (way more than 10 servings), so it may be better to make two medium loaves instead of one giant one. But that's just my personal experience.
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