Slow Cooker Matcha White Chocolate Blondies

Servings: 12 | Prep Time: 10 minutes | Cook Time: 2-2½ hours (HIGH)

Why You’ll Love This Recipe

These Slow Cooker Matcha White Chocolate Blondies are the vibrant green treat that stops everyone in their tracks. The combination of earthy matcha and sweet white chocolate creates a beautiful balance of flavors—rich, creamy, and perfectly sweet .

With just four simple ingredients and a hands-off slow cooker method, this is a fun baking project even on busy days . No oven required, no complicated techniques—just mix, pour, and let your slow cooker work its magic. The result is dense, fudgy, chewy blondies with melty pockets of white chocolate and that stunning natural green color .

Ingredients

1 box (about 15.25–16 oz) white, vanilla, or yellow cake mix
1 can (14 oz) sweetened condensed milk
½ cup (1 stick) unsalted butter, melted and slightly cooled
2–3 tablespoons culinary-grade matcha green tea powder
1 cup white chocolate chips or chunks

Directions

1. Prepare the slow cooker. Line your slow cooker with a large piece of parchment paper, letting it come up the sides so you can lift the blondies out later. Lightly mist the parchment with nonstick spray to help the edges release cleanly .

2. Mix the dry ingredients. In a large mixing bowl, whisk the dry cake mix and matcha powder together until the color is evenly bright green with no dark streaks. Take a minute to really blend it well so the blondies bake up an even, vibrant color .

3. Add the wet ingredients. Pour in the sweetened condensed milk and melted butter. Stir with a sturdy spatula until a thick, sticky batter forms. It will be quite dense—more like cookie dough than cake batter, which gives you that chewy blondie texture .

4. Fold in the chocolate. Fold in about ¾ cup of the white chocolate chips, reserving the rest for the top. Mix just until the pieces are evenly distributed .

5. Transfer to slow cooker. Scrape the batter into the parchment-lined slow cooker. Use the spatula or lightly damp fingers to press it into an even layer, reaching all the way to the edges. Sprinkle the remaining white chocolate chips over the surface and gently press them in .

6. Cook. Cover the slow cooker with the lid. If your lid tends to drip condensation, lay a clean kitchen towel over the top of the crock (not touching the batter), then place the lid on to catch excess moisture. This helps keep the top of the blondies lightly crackled instead of wet .

Cook on HIGH for 2 to 2½ hours, or until the edges are set and slightly pulling away from the sides, the top looks dry with tiny cracks, and the center is just barely set but not jiggly. Start checking around the 2-hour mark .

7. Cool and slice. Turn off the slow cooker and remove the lid. Let the blondies cool in the slow cooker for 20–30 minutes to firm up slightly. Then use the parchment paper as handles to lift the entire slab onto a cooling rack. Cool completely at room temperature, at least 1–2 hours, before cutting. This cooling time gives you dense, fudgy, clean-cut squares .

Variations

Extra matcha flavor: Add up to 1 more tablespoon of matcha powder for a bolder taste .
Lower matcha: For picky eaters, cut matcha down to 2 tablespoons and swirl in rainbow sprinkles on top .
Different chocolate: Swap white chocolate for semisweet, milk, or dark chocolate chips.
Add nuts: Fold in chopped almonds, pistachios, or walnuts.
Topping ideas: Dust with powdered sugar, drizzle with melted white chocolate, or serve with fresh berries and vanilla ice cream .

Expert Tips

Use culinary-grade matcha for the best color and flavor in baked goods .
Avoid overmixing the batter once the matcha is added to keep the blondies tender .
Every slow cooker heats differently, so start checking for doneness around the 2-hour mark .
Let cool completely before slicing for neat, clean edges .

Storage

Store leftover blondies in an airtight container at room temperature for up to 3 days, or refrigerate for up to a week. They can also be frozen for longer storage