If you don't have oil spray or cooking spray available to prevent sticking when baking with an aluminum pan, there are several alternative methods you can try:
Parchment paper: Line the aluminum pan with parchment paper. This will create a non-stick surface for your baked goods and makes cleanup easier.
Butter or margarine: Rub a thin layer of butter or margarine on the inside of the pan. This will act as a natural non-stick coating.
Shortening: Similar to butter, you can use a small amount of vegetable shortening to grease the pan.
Flour or cocoa powder: If you're baking a cake or other desserts, you can dust the pan with flour or cocoa powder after greasing it. This will create an additional barrier between the batter and the pan.
Non-stick baking mats: Silicone or parchment non-stick baking mats can be placed inside the pan to prevent sticking.
Grease with a fruit puree: For some recipes, you can use mashed bananas, applesauce, or other fruit purees as a substitute for oil. Grease the pan with the fruit puree to prevent sticking.
Reduce baking temperature: Sometimes, reducing the baking temperature slightly can help prevent sticking. Just be sure to adjust the baking time accordingly.
Avoid overbaking: Overbaking can cause the edges of baked goods to stick to the pan. Be sure to follow the recommended baking time in the recipe.
Remember that the effectiveness of these methods can vary depending on the recipe and the type of aluminum pan you're using. It's always a good idea to experiment and see what works best for your specific baking needs.