A nutrient-dense food that contains both protein and monounsaturated fat is nuts, particularly varieties like almonds, cashews, and macadamia nuts. These nuts are high in protein, provide healthy monounsaturated fats, and also offer a range of other nutrients.
Another good option is avocado; while it's not particularly high in protein compared to nuts, it contains monounsaturated fats and can be paired with protein sources like beans or yogurt to create a well-rounded dish.
Olive oil, while mostly a fat, can be combined with protein-rich foods for a nutrient-dense meal (like a salad with olives and grilled chicken or fish).
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