Tote this savory tart to potlucks and holiday gatherings. It makes perfect party food because it is easy to eat while you are balancing a glass and grazing at a buffet. Serve as an appetizer or as a vegetarian main dish.

Makes 8 appetizer servings or 4 main-dish servings

ACTIVE TIME: 1 hour

TOTAL TIME: 1 1/2 hours

EASE OF PREPARATION: Moderate

Crust
3/4 cup whole-wheat pastry flour
3/4 cup all-purpose flour
1 1/2 teaspoons baking powder
1/4 teaspoon salt
1/2 cup 1% cottage cheese
1/4 cup canola oil
1/4 cup 1% milk
1 1/2 teaspoons sugar
1 egg mixed with 1 tablespoon water for glaze

Filling
1 tablespoon extra-virgin olive oil
2 cups sliced leeks (about 2 large) (see Tip)
12 ounces cremini or baby bella mushrooms, wiped clean and sliced (6 cups)
1 large egg
1/3 cup reduced-fat sour cream
1/2 teaspoon salt, or to taste
Freshly ground pepper to taste
1/2 cup chopped scallions
1/4 cup chopped fresh parsley

1. To prepare crust: Whisk whole-wheat flour, all-purpose flour, baking powder and salt in a medium bowl. Puree cottage cheese in a food processor. Add oil, milk and sugar; process until smooth. Add the dry ingredients and pulse 4 to 5 times, just until the dough clumps together. Turn out onto a lightly floured surface and knead several times, but do not overwork. Press the dough into a disk, dust with flour and wrap in plastic wrap. Refrigerate for at least 20 minutes.
2. Meanwhile, prepare filling: Heat oil in a large nonstick skillet over medium-low heat. Add leeks and cook, stirring often, until tender, 3 to 5 minutes. (Add water, if necessary, to prevent scorching.) Add mushrooms and increase heat to medium-high; cook, stirring occasionally, until the mushrooms are tender and the liquid has evaporated, 3 to 4 minutes. Let cool.
3. Whisk egg, sour cream, salt and pepper in a large bowl. Add scallions, parsley and the mushroom mixture; toss to coat.
4. To assemble & bake galette: Preheat oven to 400°F. Coat a baking sheet with cooking spray.
5. On a lightly floured surface, roll dough into a rough 15-inch circle about 1/4 inch thick. Roll it back over the rolling pin and transfer to the prepared baking sheet. Spread the filling over the dough, leaving a 2-inch border all around. Fold the border up and over the filling to form a rim, pleating as necessary. Brush egg glaze over the rim.
6. Bake the galette until the crust is golden, 25 to 35 minutes. Let cool on the baking sheet on a wire rack for 5 minutes. Slide onto a serving platter and serve hot or at room temperature.

NUTRITION INFORMATION: Per appetizer serving: 221 calories; 11 g fat (2 g sat, 6 g mono); 31 mg cholesterol; 24 g carbohydrate; 7 g protein; 2 g fiber; 372 mg sodium.

1 1/2 Carbohydrate Servings

TIP: Tip: To clean leeks: Trim off fuzzy root and dark green stems. With a sharp knife, cut several incisions in the leek's stem end to open it up like a fan. Soak in water for several minutes, then swish to dislodge dirt. Repeat until no grit remains.

MAKE AHEAD TIP: Refrigerate for up to 2 days. Reheat on a baking sheet at 350°F for 20 to 25 minutes.