BBQ Shepard's Pie

Sometimes you're just in the mood for Shepard's Pie. I was browsing through some of my favorite cooking blogs and came across this recipe, the reason it caught my eye was its use of zucchini. It is definitely the time of year when I search high and low for any way to use the plethora of zucchini. I also really liked the addition of BBQ sauce, it's not too strong but makes you wonder what is giving such a great flavor. This was a huge hit with everyone, and I liked that it was easy to put together.

1 and 1/2 lbs. russet potatoes, peeled and cut into 1 inch pieces
1/2 cup milk
1 tablespoon butter
1/4 teaspoon each salt and pepper
1 lb. lean ground beef (or turkey)
1 medium zucchini, chopped (optional)
1 small onion, chopped
1 clove garlic, chopped or 1/4 teaspoon garlic powder
1/2 cup smoky barbecue sauce
1 teaspoon yellow mustard
1 teaspoon brown sugar
1 and 1/2 cups corn, fresh or frozen, thawed
3/4 cup shredded cheddar cheese
chopped cilantro or scallions, for garnish

Place potatoes in a large pot of coled water over medium high heat. Bring to a boil, reduce heat and simmer. Cook potatoes for about 13 minutes, or until tender. Drain potatoes and mash with milk, butter, salt, and pepper. Set aside briefly. Preheat oven to 400 degrees and grease an 8 by 8 inch casserole. In a large saucepan, cook meat with zucchini, onions and garlic, breaking up with back of spoon, until meat is just cooked. Drain if necessary. Stir in barbecue sauce, mustard and brown sugar. Transfer to prepared casserole dish. Scatter corn evenly on top. Spread potatoes carefully over corn and sprinkle with cheese. (You can refrigerate this for up to 24 hours and bake it later, if desired.) Bake at 400 degrees, just until filling is bubbly and cheddar is nicely melted, about 25 minutes.