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Most ovens require somewhere between 5-15 minutes to heat up to the desired temperature. Your oven may alert you when it is fully pre-heated. If not, consider purchasing an oven thermometer to determine precisely when it’s reached the correct temperature. Make sure the sliced almonds are arranged evenly in a single layer. You can use anywhere between 1⁄2 cup (120 mL) and 1 cup (240 mL) of sliced almonds. Spread them across an ungreased, rimmed baking sheet. A rimmed baking sheet prevents the sliced almonds from spilling over the edges and burning in the oven. The almonds will take 10-15 minutes to toast completely, but pay careful attention to avoid burning them. You'll know the almonds are done when they're fragrant and golden brown around the edges. Take the almonds out before they turn dark brown since they'll continue to cook for a bit after you take them out of the oven. Allow the nuts to cool completely before using. This will make them extra crunchy. If you left the almonds in the oven for slightly too long, transfer them immediately to a cool tray or bowl to prevent further toasting from the hot baking sheet. If you're not using the almonds right away, store them in a sealable plastic bag to preserve their flavor and texture. They will retain their texture and flavor for up to 2 weeks. Toasted sliced almonds are very tasty and versatile and can be used in a wide variety of dishes. They can add color, texture, and flavor when sprinkled on top of salads, desserts and even pizza.  Eat them on their own as a quick and healthy snack. Drizzle them in a little olive oil and sprinkle them with salt first, if you like. Mix them into cake, bread, and muffin batters. Toasted almonds are less likely to sink to the bottom than regular almonds. They will still be safe to eat after 2 weeks but will start to lose their texture and flavor. If you plan to store the almond slices immediately after toasting them, make sure you’ve allowed them to cool completely before storing. You can also freeze the nuts, which will keep them fresh for up to 3 months.
Preheat your oven to 300 °F (149 °C). Spread up to 1 cup (240 mL) of sliced almonds on a baking sheet. Cook the almonds for another 5-8 minutes or until they are golden-brown. Cool and then store the sliced almonds. Use the sliced almonds as a topping or eat them alone. Store the nuts in an airtight container for a maximum of 2 weeks.