Hey Little Mo Mo. I love muffins too. As was said there are many recipes. A lot of times when baking muffins the techniques are very important.
-Do not over stir your ingredients. I've heard a rule that never stir more than 30 times. Even that may be a bit too much. It's ok if there are still a few dry spots in your mix.
-Grease your pans well. If using papers, I usually give them a spray also.
-Make sure your oven is well pre heated and once the muffins are in, do not open the door to take a peek. This can collapse your muffins.
-Scoop even amounts of muffin batter in each paper so they will all be cooked evenly at the same time.
-Then there is the age old rule of sticking a toothpick in the middle to check if they are done. If the tooth pick comes out clean and dry, after the minimim requested time, they are finished. If there is batter stuck to them they may require another 4 or 5 minutes. Different recipes require different cooking times, so you should give it the toothpick check every time.
-I like to take the muffins out as soon as I can so they don't sweat in the tins. This could make the bottoms soggy. Use a rack or sometimes I just pull them out and leave them sitting it the original holes on an agle so the heat can escape and the bottoms can cool.
Good luck and happy munching!!