What can I do to thicken the mixture in a meat "cup?"

A little cornstarch should, if you add it with the bbq sauce, make it just thick enough to cling together a little better.

I'd say make a slurry of say 1/2c water, 1/4c bbq sauce, 1tsp cornstarch and add it to your ground beef. Let it cook down (I'm basically thinking how taco packets work here) until it's close to where you want it; continued heat in the oven should finish binding.

Or skip the bbq sauce, use dry herbs and spices mostly with just a tiny dab to bind it together.

Also you just made me want a patty, you awful man.

Looking at the recipe, I would suggest you change it in the following manner:

• Take ground beef and add to it 1/2 cup bread crumbs and the yolk of one egg and all spices.

• Break beef into balls equal to the number of cups and brown in a skillet until about half cooked.

• Place biscuit dough in cups and add a layer of bbq sauce.

• Place beef inside cups, top with another layer of sauce and cook in oven for 12 minutes

• Top with cheese and bake for another 3 minutes.

This will give you a dense meatball that will remain moist in the center, surrounded by a thickened bbq sauce that should hold it quite nicely against the biscuit. How well it holds will depend on how thick the sauce was to begin with. Also to have the meatball be less dense add less breadcrumbs.

Last night was Round Two and I wanted to share what actually worked:

• First of all, I hypothesized that part of the "looseness" was actually being caused by fat, so I added dijon mustard at about a 1:3 ratio with the BBQ sauce. Dijon seems to be a more appropriate flavour match for BBQ sauce than regular yellow mustard, which is why I chose it, but what I was really interested in here was its emulsifying properties.

• I also added somewhere between 1-2 tbsp (I didn't measure, I tasted) of honey, both to counteract the spiciness of the dijon mustard and to help thicken and bind the other ingredients. Honey is also supposed to be an emulsifier, although I've never used it as such before.

• Instead of 1 tsp of corn starch as daniel recommended, I used 2 heaping teaspoons of tapioca starch instead, dissolved in as little water as possible to avoid watering down the sauce. I didn't measure the amount of water, I just gradually incorporated more water until the tapioca was fully dissolved. Then I mixed this slurry into the sauce mixture.

• I used the original 1/2 cup of BBQ sauce in the recipe - so after all the additions I ended up with about 3/4 cup of sauce.

• I incorporated the sauce in 3 batches, although I probably only needed 2. On the first batch, I added just enough sauce to coat the meat and cheese mix, and noticed that it was actually starting to form a slight crust (great!). The tapioca really pulled its weight here. The second batch was to actually make it into a "filling", and it thickened very quickly.

• The entire mixture was simmered at medium-low heat for about 15 minutes. By the end of the simmering, the mixture was quite stiff, and some loose fat was starting to collect in the pan. I wiped off this fat instead of re-incorporating it. There was no need for a sieve this time.

What I ended up with after baking was a thick, stiff, but still moist filling, exactly what I was hoping for the first time around. There was just a hint of "crustiness" to it, which I liked, but if anyone else wants to avoid that texture then just don't add the sauce in batches, add it all at once and mix it thoroughly and then turn it straight down to a simmer.

This doesn't end up mealy and dry like a meatball, it still looks, feels, and tastes like a filling. The only concern here would be finding or making a BBQ sauce that doesn't clash too much with mustard, or possibly using a more flavour-neutral emulsifier like xanthan gum. Personally, I just used one of the "bold" store-bought BBQ sauces with a little bit of tang and kick, and that seemed to marry well enough with the dijon on my palate.

P.S. I'd recommend a non-stick pan for this. I did have to gently "scrape" the pan with a wooden spatula a few times to keep everything incorporated. I suspect that using a steel or cast-iron pan might cause some sticking/burning without constant stirring during the reducing phase.

With something like this I would actually think of adding nutritional yeast. If the cheesy taste doesn't alarm your sensibilities (the cheddar would mask it well), nutritional yeast can be a terrific thickening agent for meat dishes. It wont harden up like egg is sometimes wont to do, and it will soak up excess grease from the ground beef.

A bit of beaten egg and some breadcrumbs might work, if you're willing to go for a meatloaf-ish consistency.

Depending on what type of meal you can also use the last of your chips, when I'm doing Mexican I use my tortilla chip crumbs, but others I have adapted

This sounds like a muck-up of a short pastry meat pie? Bad idea

The simple fix is less saucy stuff and use flaky pastry instead of biscuit dough. Put a flaky pastry lid on it too to ensure zero leakage

Put the cheese on top of meat mixture, and lid on top of that

The trick is how you eat it so that the filling doesn't leak out. This isn't a cooking problem :-)