1-First Step: Get the pan and oven ready

Start by preheating your oven to 350 degrees F. Lightly grease a baking pan, or line it with parchment paper so the bars lift out more easily after baking. A parchment sling is especially helpful if you want neat slices for lunchboxes or sharing.

While the oven heats, set out your ingredients so the butter is already soft and the guava paste is easy to work with. If the paste is very firm, you can slice it into thin pieces for easier layering.

2-Second Step: Mix the dry ingredients

In a large bowl, combine the 2 cups flour, 1/2 teaspoon baking soda, 1/4 teaspoon salt, 2 cups rolled oats, and 1 cup packed brown sugar. Stir everything together so the baking soda and salt are spread evenly through the mixture.

This dry mix gives the bars their structure. The oats add chew, the flour builds the base, and the brown sugar helps the bars bake up with a warm, sweet flavor.

3-Third Step: Add the butter

Work in the 1 cup softened butter until the mixture becomes crumbly and evenly coated. You can use a spoon, a pastry cutter, or clean hands. The goal is to make a mixture that holds together when pressed but still looks a little rough and rustic.

If you are making a vegan version, this is the step where you would use a plant-based butter alternative. If the dough seems too dry, let it sit for a minute so the butter can soften the crumbs a little more.

4-Fourth Step: Press the base into the pan

Take about two-thirds of the oat mixture and press it firmly into the bottom of the prepared pan. Make sure it is even from corner to corner so the bars bake consistently. Pressing it down well helps the crust stay together after slicing.

For smaller bars or a thinner crust, you can use a slightly smaller pan. For thicker bars, use the full amount of dough and press it into a standard square or rectangular pan.

5-Fifth Step: Add the guava filling

Spread the 14 ounces guava paste over the crust. If the paste is stiff, cut it into thin strips or small pieces and place them across the base, then gently press them together. You can use a little more paste if you want a thicker fruity center, or keep it lighter for a more balanced oat-to-fruit ratio.

This is the part that gives the bars their signature flavor. Guava paste melts as it bakes, so the filling becomes soft, jammy, and fragrant.

6-Sixth Step: Add the topping

Sprinkle the remaining oat mixture over the guava layer. Do not worry if some filling peeks through. That rustic look is part of the charm of Easy Guava Cake Bars. Gently press the top layer down just enough so it sits snugly over the filling.

If you want a slightly crunchier top, leave the crumbs loose. If you like a more compact bar, press the top lightly with your fingers.

7-Seventh Step: Bake until golden

Bake the bars for about 25 to 35 minutes, or until the top looks lightly golden and the edges begin to brown. The center should look set, not wet. Every oven is a little different, so start checking near the 25-minute mark.

If the top is browning too quickly, loosely cover the pan with foil for the last few minutes. This helps the bars finish baking without over-darkening.

8-Eighth Step: Cool before slicing

Let the bars cool in the pan for at least 20 to 30 minutes. This resting time helps the filling firm up and makes cleaner slices. If you cut them too soon, the guava layer may ooze and the bars can crumble.

For the neatest squares, wait until the pan is mostly cool. Then lift out the bars and slice them with a sharp knife.

9-Final Step: Serve and enjoy

Slice the bars into 16 to 24 pieces, depending on how large you want each serving. Serve them as a snack, a dessert, or a sweet breakfast treat with coffee or tea. They are soft, fruity, and very easy to share.

If you enjoy simple baked treats, you might also like these pumpkin cream cheese muffins for another cozy homemade snack. For more breakfast ideas that work well on busy mornings, check out these protein packed breakfast burritos.