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In a medium bowl, tear 2 slices bread into small pieces. Add turkey, sour cream, 3 tablespoons chutney, 1 tablespoon mustard, chili powder, and 1 teaspoon coarse salt. Shape into 4 firmly packed 5-inch round patties.
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Freeze on a baking sheet until firm, about 30 minutes, then wrap each burger in plastic; place all burgers in a resealable freezer bag, label, and date. Freeze up to 2 months.
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To cook: Thaw burgers overnight in the refrigerator. Heat broiler with rack set 4 inches from heat. Place burgers on a rimmed baking sheet; broil until firm and cooked through, 4 to 5 minutes per side.
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Lightly toast 4 slices bread. Dividing evenly, top each with lettuce, burger, and tomato. Stir together 1 tablespoon each chutney and mustard, and serve alongside burgers.
