1 package Beef Polska Kielbasa, chopped
1 (15-ounce) can great northern beans, rinsed and drained
1/2 cup chopped onion
1/4 cup chopped orange bell pepper
1 teaspoon salt
1/2 teaspoon red pepper flakes
1/2 tablespoon garlic powder
1 (10-ounce) package frozen spinach, stems removed and rinsed
1/2 cup white wine
Preheat the oven to 375 degrees F. In a large skillet over medium-high heat, cook the beef until fat is rendered, about 4 minutes. Remove with a slotted spoon and drain on paper towels. To the oil in the pan, add the onion, bell pepper, salt, and red pepper flakes and cook until the onion is soft, about 3 minutes.
Add the garlic, beans, and beef and cook, stirring until the beans just begin to turn golden, about 3 minutes. Remove from heat.
Arrange 1/3 of the spinach in a casserole dish. Pour half of the bean/beef mixture over the spinace, and top with another layer of spinach. Pour the remaining mixture on top, and top with the remaining spinach. Pour the white wine over the top, cover and bake about 15 minutes.