1. Bring a large pot of salted water to a boil and cook the penne pasta according to package instructions until al dente, usually about 10-12 minutes. Drain and set aside.
2. While the pasta cooks, melt the butter in a large skillet over medium heat. Add the minced garlic and chopped jalapeños, sautéing for about 2-3 minutes until fragrant and softened. This step releases the spice and aroma that makes this dish so vibrant.
3. Lower the heat to medium-low and stir in the softened cream cheese. Stir continuously until the cream cheese melts into a smooth sauce, about 3-4 minutes. If the mixture seems too thick, gradually add the milk while stirring to reach your desired creaminess.
4. Add the shredded cheddar and mozzarella cheeses to the skillet, stirring until fully melted and combined. The cheese blend creates that gooey, comforting texture that everyone loves.
5. Mix in the sour cream, smoked paprika, and cayenne pepper (if using). Season with salt and freshly ground black pepper to taste. Taste and adjust the seasoning—this is where you can make the dish your own.
6. Toss the cooked pasta into the skillet, gently folding it into the sauce until every piece is coated with that luscious, creamy goodness.
7. Remove from heat and sprinkle with chopped fresh chives or green onions for a burst of color and fresh flavor.

Here’s a little secret from my kitchen: sometimes I reserve a handful of pasta water before draining, and add a splash to the sauce if it feels too thick. It helps loosen everything up and keeps the sauce silky. My grandmother taught me that little trick, and it’s saved many a batch from turning clumpy.