Preheat oven to 425. Butter your muffin tin.Heat your milk on low for about 1 min on the stove. Transfer to a mixing bowl.Melt butter in the same pan and add to the bowl. Whisk in eggs and then mix in flour. Combine all together until smooth.
Meanwhile shred cheddar and finely grate or chop a jalapeño. Combine and put aside.
Place your tin in the oven for 2 min right before baking to get it hot. Remove from oven and pour in 1 tbsp of mixture or whatever is about up to the top line of the tin. Bake for 10 min. Check to make sure tops aren’t burning, and then bake for another 2 minutes. Remove and serve!