Gourmet Garden - Red Chili Paste - If you see any recipes where I list red chili paste as an ingredient, I'm referring to this. This is perfect for adding heat without additional flavors. Personally I think it blends well into Mexican and Thai inspired food.
Ground Cumin, Chili Powder, Kosher Salt - I use these three to flavor almost everything! I don't have any specific brands I like best, but I'm always sure to look out for fillers in spices that may contain gluten.
Newman's Own - Lite Balsamic Dressing - From salad, to pasta, to chicken marinade, this dressing packs a lot of flavor with very little effort. Perfect item to keep in the fridge for quick meals.
San-J Gluten Free Tamari - You can buy this soy sauce in multiple sizes, including small individual use packets and it comes in a low-sodium option.