No, this is not allowed for those who keep kosher.
Jews dont.
Dairy and meat.
Dairy with meat.
Yes. However, most muffins are produced using dairy, so they would not likely be permitted after a meat meal.
Meat and dairy.
Jews eat all kinds of desserts, although observant Jews limit themselves to things that are kosher. Pies, cakes, ice cream and just about anything else you can imagine can be made using kosher recipes, so this doesn't put any real limits on the types of dessert. The big limit is, after eating a meal that contains meat or meat byproducts, observant Jews will not eat anything, including a dessert, that contains any dairy products. The required delay between a meat meal and a meal containing any dairy products varies. Dutch Jews have the shortest delay, an hour, while many Jews wait 6 hours.
We can eat dairy 30 minutes after meat, or meat six hours after dairy.
Jews do not eat pork, and they do not eat meat and dairy in the same meal. There are also guidelines for specific holidays, like no yeast on Passover and fasting on Yom Kippur.
Orthodox Jews keep meat and dairy separate at all times.
Meat and dairy
Meat and dairy.
Desserts that aren't dairy.