The Best and Easiest French Onion Soup
| Yield: | 4 Servings |
| Categories: | Soups, Vegetables, Easy |
| 1/4 | c | Butter |
| 3 | c | Thinly sliced onions |
| 3 | cn | 10 1/2 oz. beef broth soup |
| 4 | Holland rusk slices | |
| 1/4 | c | Grated gruyere cheese |
| 2 | tb | Grated parmesan cheese |
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