I've been trying to think of any Chinese recipes using ground/minced beef but although there are many for beef in general, not so much pertaining to ground beef. Apart from mapo tofu , which has already been mentioned, I can think of
1. Ants Climbing Trees (蚂蚁上树 - mǎ yǐ shǎng shù). Both Fuchsia Dunlop in The Food of Sichuan (eG-friendly Amazon.com link) and the relevant Wikipedia article on this Sichuan noodle dish only mention pork, but it is also often made with beef.
2. Mr. Xie's Dan Dan Noodles (牛肉担担面 - niú ròu dàn dàn miàn) is an excellent dish using beef. Again, Fuchsia Dunlop has the recipe.
3. Ground Beef in Nests (窝窝头牛肉 - wō wo tóu niú ròu) The only local dish I can think of is this, which I have had in restaurants and made myself.
The beef is stir fried with garlic and ginger (and any spices you care to include - I used cumin in the batch above) and pickled vegetables of choice and served in the buns.
There is a recipe for the buns here in Recipe Gullet.
I'm sure there are more, but I'll need my second coffee of the morning before dislodging them from what remains of my mind.