Chicken curry in a slow cooker turns out watery

A slow cooker needs a lot less water for the same recipe than something you simmer in a pan for 20 minutes. The sauce thickens in the pan because a lot of the water evaporates.

In this case, most your water is in the chicken stock. To get all of the flavor, but less moisture, drastically reduce, or even eliminate the stock. You've got plenty of water without it. Use a tsp of chicken base to keep the flavor without the water (recommended: Better Than Bouillon).

That alone will probably solve your problem. If it doesn't, come back to this question and edit it to tell us what you tried and any problems that remain, or ask a new question if the problem is different.

Welcome to Seasoned Advice.

One trick I do to keep excess water from dripping into what I have cooking in the slow cooker is.....I take a double thickness of paper towels, lay it on top of the slow cooker and then put the lid on. The paper towel absorbs the dripping beads of water and keeps it from thinning out my recipes. when the paper towel gets quite wet, I replace it with another. This little trick has made a big difference in my end product.

I agree with what several people are saying about evaporation. I also liked what someone said about using "dried" chicken bullion instead of chicken stock. however if you use this method make sure you decrease the salt you add to your dish to compensate for how salty your chicken bouillon is. You will have to play with balancing any additional liquids vs dilution of flavor concentration. Also if you add a few diced potatoes they will break down and become a natural thickener. Curry powder also has some thickening properties, thus you can increase the amount added. I often make "Jamaican Style" curry chicken which is cooked in a large pot on top of stove. The recipe calls for potatoes, very little liquid (just to almost cover chicken), and LOTS of curry powder. lol There are more ingredients of-course but the ones I listed above are the main things that regulate the consistency of the liquid in the finished dish. I have found such dishes to be a lot more flavorful if you can get the liquid to a level where there is just enough for everyone to have some "Gravy" plus a tad extra. Also I like to sear the thighs if I keep the skin on because it helps "Melt off" a lot of the fat and keeps more of the moisture inside the chicken where I want it during cooking.

I know this is an old question, but I really would recommend a frying stage to make this recipe work, in a pan just deep enough to accommodate the spinach, depending how it comes..

• An initial browning of the chicken, if desired , removed to the slow-cooker
• Frying the onions out to translucency
• The addition of spices and garlic to release their flavor into the oil, (care not to burn)
• Addition of mushrooms to reduce/brown them to taste
• Now we start to boil, rather than fry... deglaze the pot with spinach and tomatoes: let the spinach collapse and evaporate a lot of its liquid..
• Add enough stock to make a coating consistency.
• Combine with the chicken in the slow cooker.

Obviously a few variations according to taste, here, (For example a lot of stews, especially non- European, don't brown meat,) but the object is to avoid having uncooked spices floating around in the liquids from the spinach/mushrooms/tomatoes/stock. Higher, frying temperatures are needed to make the most of some of these ingredients, IMO.