Hey there! I've made some coconut oil treats with success. Here's my process:
I make sure the herb is thoroughly dry and grind it VERY fine. A coffee grinder works nicely for this. The next thing I do is called decarboxylation. It will help your treats to be even more potent. Preheat your oven to 200 degrees Fahrenheit. Then place the ground up herb thinly and evenly on a cookie sheet covered with aluminum foil. Place the cookie sheet on the middle rack and leave it in for 20-25 minutes. It will smell A LOT at this stage, so take precautions. The next step is a variation of your crockpot method that will guarantee that the coconut oil won't burn and your end product will not taste like herb.
Into your Crock pot put WATER and bring it to a boil. Then add about twice the coconut oil that your recipe calls for. Some of it will evaporate during the cooking process. Next add the herb, stir, and bring down the temperature to a simmer (barely seeing small bubbles rising) Leave it on simmer for 2-4 hours, stirring regularly. When it's done, pour the whole mixture through a fine strainer, cheesecloth, etc. to strain out the plant material. The plant material is now useless and may be thrown away. Careful, its hot...strain the mixture into a pyrex bowl, or let it cool down first. What's left in the pyrex bowl is a mixture of the now THC infused oil and water. Put this mixture in your refrigerator, NOT YOUR FREEZER, overnight.
In the morning, you will see that the oil has separated from the water and solidified. Simply take the now solid coconut oil out of the water. The water contains a lot of the nasty tastes and makes your oil cleaner. If you wish, you can repeat the process by melting the coconut oil in boiling water for a few minutes and then straining it again into a bowl and refrigerating it again. This won't increase potency, but if you do it three times, you'll notice no herb taste in your treats.
Final step: Melt your coconut oil in a pyrex measuring cup and make sure it's enough for the recipe you're using. If it's less because of evaporation, just add more regular coconut oil to make up the difference. Then simply mix the melted (BUT NOT HOT!) oil, into your recipe and cook as usual except, and this is important: 300 DEGREES FAHRENHEIT MAX! NO MATTER WHAT THE RECIPE SAYS! Your treats make take longer to finish at that temp, but go over it for long enough, and you treats will lose potency. Good luck!