Step 1Place a large baking dish (approximately 20cm x 30cm) in the oven and preheat to 200°C.
Step 2Meanwhile, spray a non-stick frying pan with oil and place over medium-high heat. Cook mince, stirring, for 2 minutes, or until just browned. Add beans, spinach and half the canned tomatoes, and cook for a further 2 minutes, or until heated through.
Step 3Remove baking dish from oven and spray with olive oil. Fill and roll each tortilla with a large spoonful of beef and bean mixture, and place them side-by-side in the baking dish. Spoon over remaining tomatoes and sprinkle with grated cheese.
Step 4Bake for 10–15 minutes, or until heated through and the cheese is melted. Top with sliced avocado, season with cracked black pepper and serve with the mixed salad leaves.