Use a 1:1 ratio of oats to liquid (milk + yogurt combined), then adjust by adding 2-3 tablespoons extra liquid if using thicker yogurt, ensuring your overnight oats reach a creamy, spoonable consistency by morning.

Lightly toast the crumbled Biscoff cookies in a dry pan for 2-3 minutes before topping to intensify their caramelized flavor and maintain crispness longer, preventing them from softening into the oats.

Reserve half your Biscoff cookie butter to swirl in after mixing and again on top just before serving, creating flavor pockets and visual appeal while preventing it from becoming evenly distributed and diluted.

Use glass mason jars instead of bowls to allow better layering and flavor distribution, plus they seal tightly to prevent oxidation of delicate ingredients and keep your oats fresher for up to 5 days.

Soak chia seeds in 2 tablespoons of milk for 15 minutes before adding to create a gel that thickens your oats evenly, rather than letting them absorb liquid unevenly throughout the night and create gritty spots.