1. Preheat oven to 425 degrees. Toss squash with oil and spices. Arrange in a single layer on a cookie sheet. 2Bake for 15 minutes. Remove from the oven and toss in poblano pepper strips.
Place sirloin chunks and 1⁄4 cup Italian dressing in a gallon size zip top plastic bag and the vegetables and the remaining 1⁄4 cup dressing in another bag. Seal the bags and refrigerate for 30 minutes.