Preheat broiler or oven to 400ºF.
Place the spinach in a food processor with garlic, butter, salt, freshly ground black pepper and cheese, and process until smooth.
Cut the bread in half lengthwise and slather each side with the spinach butter. Broil or bake the toast until crispy, about 3 minutes under the broiler or 6-7 minutes in the hot oven.
Cut the toast into large cubes and serve alongside Beet Risotto.