Spread hummus on the tortilla in a thin layer. Place the spinach in the middle in a layer of each tortilla. Place the peppers and onion on one side and black beans on the other side. Layer cheese on top of everything.
ightly roll up the tortilla, keeping it as tight as possible and rolling smoothly at the end (don’t worry if a little bit falls out!). Slice off the ends and either eat or discard; then slice the remainder into 8 pieces. Serve immediately with salsa (optional) or refrigerate until serving. They’re perfect for lunches.