Warm the berries. Add the berries to a small saucepan over medium heat.
If using fresh berries, add 1 to 2 tablespoons of water to get things started. Cook for 5 to 7 minutes, stirring and gently mashing as they soften.
Sweeten and season. Stir in your sweetener of choice, lemon juice, and a pinch of salt. Taste and adjust—add more sweetness for a dessert vibe, or keep it lightly sweet for a breakfast feel.
Add chia seeds. Sprinkle in 2 tablespoons of chia seeds and stir well.
Let the mixture simmer on low for 1 to 2 minutes, then remove from heat.
Let it thicken. Set the pan aside and let the jam sit for 10 to 15 minutes. The chia seeds will thicken the mixture as it cools. If you want it thicker, stir in another 1/2 to 1 tablespoon of chia seeds and wait a few more minutes.
Toast the bread. While the jam sets, toast your favorite bread until golden.
If you like a little richness, add a thin layer of butter or coconut oil while it’s warm.
Assemble the toast. Spread a layer of creamy topping if using (cream cheese, ricotta, yogurt, or nut butter), then spoon the chia berry jam on top. Finish with a sprinkle of lemon zest or a pinch of cinnamon if you like.
Serve warm or chilled. Enjoy right away, or chill the jam for a thicker, more set texture.