- Optional: to have roasted red peppers on your sandwich, preheat broiler.
- Cut pepper quarters into strips. If roasting, place peppers on a rimmed baking sheet, skin-side up; broil 5 minutes. Rotate pan; broil until skin is blackened and blistered, about 3 to 5 minutes more. If having fresh peppers, simply cut into slices and set aside.
- Transfer peppers to a bowl, and tightly cover. Let peppers cool enough to handle, about 10 to 15 minutes; remove skin with your hands and cut pepper quarters into strips.
- Place beans, garlic, lemon juice, oil, cumin and salt in bowl of a food processor; process until smooth.
- Spread about 1/4 cup bean mixture on each of 2 slices toast; top each with 1/4 of roasted or fresh pepper, cucumber and spinach. Spread avocado onto remaining slices of toast; top sandwiches with toast and serve.
- Notes: Bean spread can be made up to three days ahead and refrigerated, or frozen to keep for up to 3 months in the freezer.